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Wharton Professor Marshall Fisher: The New Science of Retailing

July 21, 2011 / 28:58

This episode features Marshall, who discusses the challenges retailers face in matching supply and demand, the impact of inventory management on profits, and the importance of data analysis in retail.

Marshall explains that retailers often end up with excess inventory, leading to deep discounts and lower profits. He cites statistics showing that many customers leave stores empty-handed due to stockouts, which can significantly affect a retailer's revenue.

He emphasizes the need for better inventory management and forecasting to improve sales. Marshall also highlights how retailers can identify high-demand products by analyzing sales data at a granular level.

The conversation touches on the importance of flexible supply chains and how companies like Zara have successfully implemented agile practices to respond to market demand quickly.

Finally, Marshall advises retail managers to focus on staffing and customer experience, noting that investing in personnel can lead to increased sales and customer satisfaction.

TL;DR

Marshall discusses retail inventory challenges, data analysis, and strategies for improving profits and customer experience.

Episode

28:58
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[Music]
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[Music]
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Marshall thank you so much for joining
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us today my pleasure M thank you for
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having me I'd like to start talking
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about your book with a simple question
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you you say that retailers often fail to
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match supply and demand what are the
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consequences of that failure for them um
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well you see one of the consequences
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when you walk in many stores um which is
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huge piles of merchandise uh on sale at
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deep discounts as much as 80% there's a
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department store I visit from time to
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time for various reasons and you'll see
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the aisles sorted into maybe three
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sections 50% off 70% off 80% off so
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that's one consequence um the
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consequence uh for retailers is uh is
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obviously lower profit which can come in
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one or two ways the the access that we
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just talked about which means you're
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selling
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things uh frequently below what it cost
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you to to buy it and get it into the
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store so you lose
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money uh or
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uh that's the excess side or you don't
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have enough of something and the
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customer walks in and can't find what
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they're looking for and that's a lost
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sale so there's a couple interesting
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statistics that uh until
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1995 when it um got embarrassing
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department stores used to um collect and
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Report uh an industry number which is
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the markdown percentage
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okay in the mid if I remember right in
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the mid 70s that was about
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6% and by 95 had had grown to something
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like 33% it's not publicly reported
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anymore but I heard a statistic that for
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one leading department store that number
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would now be
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40% which means that the average item
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sells for 40% off of full
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price uh that's on the excess side on
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the shortage side there's a consulting
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firm that does an annual survey of
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consumers this is in apparel um where
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it's maybe hardest to match Supply with
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demand but they routinely uh find that
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uh people who respond to the survey will
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will say that about a third of the time
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they walk into a store with a clear idea
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of what they want to buy and walk out
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empty-handed because they couldn't find
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what they came
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for which is pretty amazing if you think
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about it that A2 billion doll retailer
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is really a $3 billion retailer but that
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third billion in Revenue they're not
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getting because the the of the third of
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the people who walk out empty handed
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because they couldn't come find what
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they came for now does that imply that
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if retailers are able to make even small
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improvements in matching Supply with
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demand that this would have a fairly big
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impact on their profits yeah absolutely
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for a simple reason retailing is a high
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fixed cost business it costs a lot of
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money to maintain a store base and pay
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the associates that work in those stores
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and you incur that cost whether you sell
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a dollar of merchandise in the in the
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store or 10 million so small increases
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in Revenue have a big impact on profit
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uh typical numbers for gross margin
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would be somewhere between 30 and 50% so
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take a retailer whose gross margin is
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50% uh 5% increase in
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sales uh with a 50% margin is 2 and a
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half% of Revenue increase in profit
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which for a lot of retailers would
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double their profit so this one-third
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that walk out empty-handed because of of
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stockouts or they can't find the product
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in the store or some sort of shortage
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problem just correcting a little bit of
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that uh you know cut that number from a
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third to to 5% less uh could double the
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Retailer's profit that's very and what
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imp applications does the relationship
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of the stock market valuation of a
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retailer have to its ability to manage
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its
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inventory
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um that's an interesting question
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because most
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analysts uh I think don't pay enough
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attention to uh to inventory or other
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operating variables of a
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retailer uh and you can think of a
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number of them but if we take uh
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inventory as an example a retailer
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can uh enhance its Revenue line with
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more inventory okay so come back to the
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example I described is that you'd like
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to have U Better in stock so that people
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find what they came
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for uh when they walk in the store uh
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the the best the the right way to
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accomplish that is more effective
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management of your inventory better
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forecasting U you know better analysis
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of the margin of error on the forecast
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so you can risk
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adjust the heavy-handed way to
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accomplish it is just jack up your
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inventory levels and you can uh improve
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in stocks with a in inefficient process
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a retailer who does that will see an
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increase in Revenue but it's not a real
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Improvement in the effectiveness of
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their performance but it can look that
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way to the stock market so if the market
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doesn't take into account the
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relationship between revenue and
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inventory uh they can be fooled that a
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retailers is having a good year when all
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they're doing is uh forcing sales by by
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uh pumping excess inventory into an
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inefficient
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system that brings us does that make
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sense yes no absolutely it's sort of a
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subtle little bit complicated idea but
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yeah no absolutely uh in fact that that
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uh brings me to uh one of the really
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interesting points in your book where
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you note that ret many retailers are
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drowning in numbers but lack an Insight
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uh how do you think they can correct
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this
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problem uh well well that was actually a
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poster on the door of a woman that we
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worked with who was the vice president
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for uh merchandising technology I think
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was her
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title and the quote was we're a washing
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data and star for information
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interesting yeah well the short answer
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to your question is they should buy this
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book and read it and implement the
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results because that's essentially what
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we tried to do in this book is report
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about 10 years more than 10 years of of
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experience we've had working with
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retailers who who were a wash in data
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but star from information and helping
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them to
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interpret uh all kinds of data starting
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with POS sales data uh customer
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satisfaction surveys and um demographic
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data about their
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Stores um if you think about what would
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cause you to be a wash in data but star
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from
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information um there are many things but
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I'll mention a couple one is one is a
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lot of retailers until recently have not
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had sufficiently granular data this may
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surprise you but an apparel item this
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shirt I'm
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wearing what they would see is sales of
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this shirt for the entire chain across
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all
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sizes okay they would not see the sales
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of this shirt in a medium
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in XYZ store last
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week so they're left to to
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guess uh the level of in stocks across
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the stores they're left to guess is what
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is the right size mix so so that's point
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one is until recently the data was was
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too aggregated to be useful you need at
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the microscopic level how's this shirt
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selling in the Iowa store in a medium
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today
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the second point is that it's not enough
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to to to know whether an item is selling
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well whether it's hot and you want to
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get more of it it's not enough to know
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at sales level you got to know it sales
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level and other conditions that might
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affect uh uh the sales of that product
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competitive activity weather uh how it's
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priced how it's presented in the store
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is it well presented or is it somehow
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hidden in the back
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room and so most retailers don't collect
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that data they don't interpret it uh so
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you need to look at
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sales and a handful of factors that are
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sales drivers uh in order to accurately
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uh predict from how an item selling how
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it we'll sell in the future those are a
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couple things that could go on and on
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and on but it's it's uh doable but but
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nontrivial to look at the the huge
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amount of data retailers have available
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to them now it makes sense out of it but
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but you can and then it's very powerful
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well one of the things that makes it
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powerful is uh you also mentioned in
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your book how retailers can crunch their
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sales numbers to identify some home run
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products which they may be missing uh
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can you explain how how that how they
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can do that yeah absolutely so retailer
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the retail assortment is the set of
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products that's in the store at any
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point in time when you walk in and
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retailers will periodically update their
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assortment they'll get rid of products
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that are not selling so well and add
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some new products that they think will
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sell
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better the uh and you can think about
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those two decisions get rid of the worst
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Sellers and add some new products which
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is the easier the decision at least on
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which to get rid of is easier because
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you've got sales data so you can tell
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the dogs you got to be a little careful
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that
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that product that's not selling very
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well is the favorite product of some of
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your best customers and if you get rid
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of it you not only lose the sales on
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that product but you lose the customer
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and everything else they're buying it's
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a it's a serious problem in grocery okay
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but other than that kind of subtlety
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that's pretty easy to figure out what to
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get rid of but what to add is harder so
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a lot of retailers do something kind of
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like uh Jin rmy you know the card you
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discard your worst card and you draw
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randomly another card from the deck so
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they'll add another
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uh product my colleagues and I thought
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about how could we give better guidance
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on that and the idea we uh deployed is
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to think of a a product a stock keeping
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unit we call it a skew as defined by its
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attributes so this shirt I'm wearing
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would you know would be a knit it's
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short sleeve it's a certain color it's a
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certain
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size um and then use the sales of your
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current products and we would do this in
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each and every store to estimate the
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demand that customers have for uh for
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attributes and then you can do something
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very powerful which is to
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um if I know there sales of this color
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and of short sleeve shirts and of
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mediums I can figure out uh sales of
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other products that are different
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combinations of attributes that I'm not
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currently selling and we found amazingly
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that there'll
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be uh products that the retailer thought
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there was no demand
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for uh so they didn't have very much of
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it but if you analyze the data right you
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see that there's a huge demand that can
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you give an example yeah sure Tire we
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worked with a tire
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retailer um
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and one of the attributes was the price
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and quality level they had six different
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price quality levels from cheapest to to
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highest
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price they didn't think uh it
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appropriate to carry very much of the
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cheapest tire so across something like a
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hundred different sizes there were only
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nine of these sizes in which They
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Carried the lowest price lowest Quality
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Tire and so therefore they didn't sell
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much of it it was only 5% of their sales
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therefore confirming
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their belief that customers really
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didn't want to buy this cheap tire if
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you looked at the
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sizes the nine sizes that They Carried
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this lowest price point
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in uh across the six it represented 60%
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of Revenue it outsold the next next
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bestselling I think by 10 to1 so the
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customers if you look carefully at the
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data we're screaming hey price matters
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to us you know we and and the
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neighborhoods that these stores were in
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were less wealthy neighborhoods it was
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not surprising so there was a whole set
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of call them home run products that they
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were not aware of because of this
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self-fulfilling prophecy that we don't
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think our customers want to buy low pric
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cheap tires so we're not going to carry
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them and we don't sell a lot of them and
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we were right in fact they were dead
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wrong and there was a huge opportunity
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there so so that's something we found to
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be very interesting absolutely well
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another issue that uh you you bring up
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in your book is that uh inflexible
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Supply chains is the ban of almost all
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retailers uh what are some of the ways
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in which a supply chain can become more
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agile um well I would start answering
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your question by referring back to the
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beginning of this interview where we
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talked
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about uh the average markdown in a
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department store now is 40% signaling a
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huge amount of of excess supply of some
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products yet uh C customers who fill out
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a survey uh say onethird of the time we
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can't find what we came for so there's
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also
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shortage uh how do you correct that how
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you better
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match Supply with demand have less of
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the wrong products more of the right
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there there really three things you can
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and you need to do all three together
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more accurate forecast
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a better choice of the right inventory
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levels and a flexible supply chain which
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means uh short lead time the ability to
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uh Supply the quantity the market needs
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efficiently which might be a lot or
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might be a little uh what has caused uh
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Supply chains to be INF
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flexible uh over time I think
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is uh a number of but probably the
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biggest one is the pursuit of low
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cost uh by sourcing from Asia China
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being at the head of the class in terms
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of countries that people Source from uh
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I actually first visited China teaching
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in a warden program for six weeks with
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my family in
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1982 in
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Shanghai and the uh pretty much the only
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other westerners we saw were buyers from
00:15:57
apparel companies and they were the
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first wave you know that was really the
00:16:02
beginning China normalized relations
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with the US in
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1979 um and that's when apparel
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companies realized that wage rates in in
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China
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were what 3% of what they were in the
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United
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States and that caused a flood of
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gravitation of sourcing of of products
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from apparel toys consumer electronics
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uh many other things from China and
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other Asian countries so that's a
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lengthen the supply chain from miles to
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halfway around the world that's probably
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the biggest Factor that's caused Supply
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chains to be uh
00:16:43
inflexible there are lots of other
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choices you make in a supply chain
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between slow and cheap versus fast and
00:16:51
expensive like do you ship by boat or by
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air you can measure cost and companies
00:16:59
are very conscious of costs the value of
00:17:03
speed is harder to measure that value is
00:17:07
better in stock better Revenue but you
00:17:10
don't have a direct measurement so you
00:17:11
know it costs you an extra $3 to ship
00:17:15
something by air the gain you get from
00:17:18
that is um is
00:17:22
unknown and probably in the future you
00:17:25
you pay the $3 today the gains in the
00:17:27
future so there a tendency for what's
00:17:32
immediate and measurable cost to be
00:17:35
overweighted relative to what's harder
00:17:39
to which which is valuable but harder to
00:17:42
measure speed and flexibility of the
00:17:44
supply chain so every time there's a
00:17:46
fork on the road for companies do I pick
00:17:48
slow and cheap or fast and expensive the
00:17:50
bias is to take the slow and cheap route
00:17:52
yeah now you do mention in your book the
00:17:55
example of companies like world and Zara
00:17:58
yes that have done really some very
00:18:00
Innovative things with their supply
00:18:01
chains uh are there lessons that other
00:18:03
companies could learn from their
00:18:05
experience I of course of course there
00:18:08
are well described in the book I think
00:18:11
um the uh I think the first lesson is to
00:18:16
know in this choice between slow and
00:18:18
cheap fast and inexpensive when is it
00:18:20
appropriate to choose fast and
00:18:22
inexpensive um it's not appropriate
00:18:26
for stable product with very predictable
00:18:30
demand we use an example of Campbell's
00:18:32
chicken noodle soup it's been around for
00:18:35
more than a hundred
00:18:37
years um long shelf
00:18:40
life uh so excess inventory is not going
00:18:43
to go obsolete you'll sell it eventually
00:18:45
you may have to hold it a little longer
00:18:47
uh very predictable demand uh you don't
00:18:50
need speed and flexibility in the supply
00:18:52
chain for that you can contrast that
00:18:55
with fashion apparel toys uh with this
00:18:59
huge Spike demand at
00:19:02
Christmas uh many consumer electronics
00:19:04
products
00:19:06
products that have a a gross margin of
00:19:09
50% or more so missing a sale is
00:19:13
extremely
00:19:14
expensive uh for those products um you
00:19:17
need flexibility
00:19:19
Zara uh which is pretty well known world
00:19:22
as a Japanese
00:19:24
retailer less well known in the west
00:19:27
because they sell only in Japan but some
00:19:28
similar practices to Zara and then just
00:19:31
a couple miles from where we're sitting
00:19:33
here in Philadelphia's Destination
00:19:35
Maternity um a company started by
00:19:39
Rebecca Matias a graduate of the
00:19:40
University of
00:19:42
Pennsylvania uh with a crushingly
00:19:45
dominant 50% share of the women's
00:19:48
maternity Market all three of these
00:19:51
apparel uh firms have adopted uh a DNA
00:19:57
of speed and flexibility
00:19:59
they they can get back in stock produce
00:20:03
more and get back in stock on a hot
00:20:04
selling item in two weeks whereas that
00:20:07
number
00:20:09
for uh other retailers would be measured
00:20:12
in months usually four months or more
00:20:15
which it which for a seasonal product
00:20:17
means it's game over if it's selling
00:20:20
well too bad you can't get back in stock
00:20:24
and they do a whole set of things some
00:20:25
of are sort of obvious and mechanistic
00:20:27
they they'll buy undyed
00:20:30
fabric uh and keep it in inventory so
00:20:33
they can quickly cut it and dye it they
00:20:34
use a laser for cutting so they can cut
00:20:36
a single layer of fabric the
00:20:40
less mechanistic obvious thing they do
00:20:43
which I think many retailers Miss is
00:20:45
they realize that if you want to quickly
00:20:48
react to demand get back in stock on a
00:20:50
hot seller the time uh to make decisions
00:20:54
needed to do that uh for many retailers
00:20:57
will be rather lengthy and will be a big
00:21:00
part of the L time so they
00:21:03
Empower uh product brand-based teams in
00:21:06
the trenches uh the lowest rung of the
00:21:10
of the organizational ladder to be
00:21:12
empowered to make decisions you want to
00:21:14
make more of this product you can't get
00:21:16
exactly this button but you can get one
00:21:19
like it is that okay they can decide yes
00:21:22
or no yeah it's okay the team will have
00:21:25
a designer on it and they'll say yeah
00:21:26
that'll work so they'll be somewhat uh
00:21:29
Scrappy and Street Smart in uh in
00:21:34
matching what the materials they can get
00:21:37
with what the Market's telling us is
00:21:39
needed by the market uh any any thoughts
00:21:42
on how retailers can improve their store
00:21:44
level execution first of all I think we
00:21:47
all shop and we all uh Experience Store
00:21:54
execution uh when we go to a store can
00:21:57
we find a parking spot or
00:21:59
not uh is it easy to find the entrance
00:22:02
when we get in is the store easy to
00:22:05
navigate uh does it look neat and tidy
00:22:08
or messy if we need help can we find
00:22:11
somebody there's a whole set of uh
00:22:13
components of our shopping
00:22:16
experience uh that affect how we feel
00:22:18
and are we going to next time we get to
00:22:20
the end of our driveway are we going to
00:22:22
turn left and go back to that retailer
00:22:24
or turn right and go to the competitor
00:22:26
when I ask my students when I talk about
00:22:28
stor
00:22:29
execution uh who's had a bad experience
00:22:33
shopping uh every hand goes
00:22:36
up who's had a bad experience that made
00:22:38
you really
00:22:40
angry every hand goes up and I could
00:22:44
spend 80-minute class just listening to
00:22:47
viscerally angry stories about bad
00:22:50
experiences they've had trapping I just
00:22:52
suspect you've had that I know I have
00:22:53
everybody has and it's a huge huge
00:22:56
problem for retailers right
00:22:59
uh there's a a couple ideas described in
00:23:04
the book that I think are important one
00:23:06
is getting Staffing levels right in the
00:23:10
store the uh quantity and
00:23:14
experience of the store associates we
00:23:17
worked with a number of retailers who
00:23:19
collected customer satisfaction data
00:23:22
surveys from their customers on shopping
00:23:24
experience and you could
00:23:26
correlate uh how
00:23:29
satisfied was the customer and their
00:23:30
overall number with factors that might
00:23:35
drive that satisfaction and almost
00:23:38
always across a variety of retailers it
00:23:41
was three things if I need help can I
00:23:43
find it is the person knowledgeable and
00:23:46
helpful to me the store associate and
00:23:48
can I find the product I came to buy so
00:23:51
at the end of the day people who shop
00:23:53
have a mission and if they can
00:23:54
accomplish their mission they're happy
00:23:56
uh so we've generally
00:23:59
found that stores on average are underst
00:24:02
staffed and again it comes back to the
00:24:05
measurable being overweighted relatively
00:24:08
unmeasurable you write a check at the
00:24:10
end of the month for salary for your
00:24:12
store associates that's measurable known
00:24:13
and immediate the value of having 10%
00:24:18
more payroll budget and therefore 10%
00:24:20
more people in the stores um is harder
00:24:23
to measure so retailers tend to staff we
00:24:26
developed a statistical technique for
00:24:30
correlating Revenue with level of
00:24:33
Staffing in a retailer based in part on
00:24:37
these customer satisfaction surveys and
00:24:39
we found in one example that uh every
00:24:45
dollar more you spent on
00:24:49
payroll added $10 in revenue on average
00:24:54
it varied by store and by months so you
00:24:56
had to apply it in a granular way cuz
00:24:59
some stores were overstaffed you wanted
00:25:00
to cut them but but this technique lets
00:25:03
you measure the revenue impact of
00:25:06
payroll uh now you think about the
00:25:08
economics to spend a dollar this month
00:25:12
to get $10 in Revenue this
00:25:14
month uh with a 50% margin you're
00:25:17
getting $5 in profit for a dollar in
00:25:19
expense that's a great deal and it's not
00:25:22
an investment because it happens within
00:25:23
the current month so that was what we
00:25:27
saw as a execution void is number one an
00:25:30
overweighting of of the payroll expense
00:25:33
viewing labor as sort of an expense
00:25:35
rather than an investment and number two
00:25:37
not being able to to
00:25:41
staff in a way that takes into account
00:25:44
the impact of Staffing on on revenue and
00:25:48
one final question Marshall what advice
00:25:50
would you give managers of retail
00:25:52
companies to help them Succeed In The
00:25:55
New Normal global economy oh well this
00:25:59
uh New Normal is uh hard to Define but
00:26:04
uh let let's first of all say what how
00:26:08
that phrase is often used is we've just
00:26:10
been through the worst e economy or in
00:26:14
the midst really in some ways if you
00:26:16
look at unemployment are the worst
00:26:17
economy that you and I have
00:26:19
experienced so far I think the Great
00:26:22
Depression of the
00:26:24
30s is in first place but who knows how
00:26:28
this is all going to play out so there's
00:26:30
this sense that the economy will
00:26:33
recover but that it will be uh somehow
00:26:37
fundamentally
00:26:39
changed uh in ways that
00:26:42
are uh hard to discern I'll just mention
00:26:48
one possibility which many retailers
00:26:52
believe is that during a recession uh
00:26:57
people become more price
00:26:59
conscious and if you look at the impact
00:27:02
of the recession on retailers for the
00:27:04
vast majority maybe 90% it was bad news
00:27:08
Revenue went down
00:27:10
surprisingly there's some retailers that
00:27:13
are counter that do better do as well or
00:27:16
better so who would you guess would be a
00:27:20
counter cyclic retailer that does better
00:27:23
in tough
00:27:24
times probably the the discount
00:27:27
retailers yeah so who be at The Head of
00:27:29
the Class the Walmart Walmart yeah
00:27:32
Walmart auto parts retailers right right
00:27:35
any any do-it-yourself
00:27:37
retailer uh did as well or
00:27:41
better during the
00:27:43
recession will that
00:27:45
persist um is a very interesting
00:27:48
question
00:27:50
uh and of course the W Walmarts of the
00:27:53
world say of course it will
00:27:55
fundamentally people have changed their
00:27:57
buying Behavior avior and price matters
00:27:59
more now and will and there's a whole
00:28:01
generation that went through this lousy
00:28:03
economy like the depression generation
00:28:05
and they're going to think about life
00:28:06
differently and they're going to be more
00:28:08
price conscious um the other thing
00:28:11
that's going on now and I think will
00:28:13
persist for a long time it's
00:28:15
deleveraging people are paying off their
00:28:17
credit card bills which means they're
00:28:19
spending less so there's a great
00:28:22
reduction in consumer spending levels
00:28:25
that's going to have a big big impact on
00:28:27
retailing
00:28:28
great Marshall thank you so much for
00:28:30
speaking with us today M it was my great
00:28:32
pleasure thank you for having me
00:28:38
[Music]

Episode Highlights

  • The Cost of Excess Inventory
    Retailers often face markdowns of up to 40% due to excess inventory, impacting profits.
    “The average item sells for 40% off of full price.”
    @ 02m 18s
    July 21, 2011
  • Lost Sales Due to Stockouts
    One-third of customers leave stores empty-handed because they can't find what they want.
    “A $2 billion retailer is really a $3 billion retailer.”
    @ 02m 58s
    July 21, 2011
  • Data Overload in Retail
    Many retailers drown in data but struggle to extract actionable insights.
    “They're a wash in data but star from information.”
    @ 06m 50s
    July 21, 2011
  • Retail Staffing Insights
    Every dollar spent on payroll can yield $10 in revenue, highlighting the importance of staffing.
    “Every dollar more you spent on payroll added $10 in revenue on average.”
    @ 24m 49s
    July 21, 2011
  • The New Normal in Retail
    Retailers must adapt to a fundamentally changed economy where price consciousness prevails.
    “People are going to be more price conscious now.”
    @ 28m 08s
    July 21, 2011

Episode Quotes

  • Retailing is a high fixed cost business.
    Wharton Professor Marshall Fisher: The New Science of Retailing
  • We're a washing data and star for information.
    Wharton Professor Marshall Fisher: The New Science of Retailing
  • Customers are screaming, 'Hey, price matters to us!'.
    Wharton Professor Marshall Fisher: The New Science of Retailing
  • If they can accomplish their mission, they're happy.
    Wharton Professor Marshall Fisher: The New Science of Retailing
  • Every dollar more you spent on payroll added $10 in revenue on average.
    Wharton Professor Marshall Fisher: The New Science of Retailing
  • People are going to be more price conscious now.
    Wharton Professor Marshall Fisher: The New Science of Retailing

Key Moments

  • Excess Inventory02:18
  • Stockouts02:58
  • Data Insights06:50
  • Customer Satisfaction23:54
  • Payroll Impact24:49
  • Price Consciousness28:08

Words per Minute Over Time

Vibes Breakdown

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