The Sharp Cut: Who Actually Buys on Sale?
EP 246 · Oct 22, 2026 · 21 min · Marc & V
0:00 / 21:03
The short version
Marketing runs on comfort blankets. The Sharp Cut cuts them up to see what’s inside. This week, with Black Friday five weeks out and someone already writing the 40% off email: the idea that a discount wins you new business.
Here’s the spine. A discount rents you this week’s sales, mostly from your own customers. When the price goes back up, the rental’s over. So every promotion has to pay for itself while it’s running.
This week:
→ Who actually buys on the deal. Ehrenberg-Bass looked across 18 categories: 77% of promo buyers had already bought the brand in their last five trips, against 81% at full price. Basically the same people, paying less.
→ How long the bump lasts. Soup and yogurt promotions faded in about two weeks, and in only 1 of 29 cases did a deal change sales for good. Then the dip, and people learning to wait for your price.
→ The math nobody runs. At 20% off with a 50% margin you need two-thirds more sales just to stand still. A German retailer celebrated a 19%-off sale that needed triple the traffic to break even.
→ Three people, three kinds of math. The store, the supplier, and the salesperson are each optimizing something different, and the brand on sale is usually renting its own buyers back.
→ What actually works. You can’t quit cold (ask JC Penney). McCain pulled promotions back slowly and moved the money into brand, and nine years later sells more chips at a higher price.
Plus the one takeaway: a discount gives the people who already buy from you a cheaper week, and you often pay for it twice.
Enjoy the show!
Stories & evidence this episode:
- Which? Black Friday investigation: https://www.which.co.uk/policy-and-insight/article/dont-believe-the-hype-most-black-friday-deals-the-same-price-or-cheaper-at-other-times-of-the-year-which-finds-a3TbD5x5KADs
- Ehrenberg-Bass / John Dawes, price promotions and buyer mix (SSRN): https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2199169
- McCain, “When the chips are down, margins matter” (IPA): https://ipa.co.uk/knowledge/case-studies/when-the-chips-are-down-margins-matter-how-a-focus-on-long-term-emotional-brand-building-reduced-price-elasticity-and-increased-profits-for-mccain
- The Evidence Line (180+ models): https://quatical.com
Chapters
00:00 What the Sharp Cut is, and this week’s comfort blanket
00:50 Black Friday five weeks out, and the Which? study
02:18 How Black Friday became Black Friday month
03:50 Hermann Simon, BMW, and who really sets price (ep 18)
04:57 Who’s actually buying on the deal (Ehrenberg-Bass)
06:10 But explain P&G: the coupon cut and the share loss
06:50 How long the bump lasts, and the margin math
07:55 The 19%-off sale that needed triple the traffic
08:40 Soup, yogurt, Coke, and learning to wait
09:15 When the coupon becomes the price (Bed Bath & Beyond)
09:50 Loss leaders, pocket price, and a rebate that expired
11:58 B2B: value sellers vs price sellers, and commission math
14:49 Why not just stop? Walmart, good vs bad market share
15:40 JC Penney cold turkey vs McCain’s slow pullback
17:20 Honest pricing, anchoring, and the law
18:32 The one takeaway: you pay for it twice
19:00 Recap and what to change on Monday
Hosts
Marc Binkley
Quatical - https://quatical.com/
LinkedIn - https://www.linkedin.com/in/marcbinkley/
Vassilis Douros
Personal Website: https://vassilisdouros.com
LinkedIn - https://www.linkedin.com/in/vassilisdouros/
Follow The Sleeping Barber
Website: https://sleepingbarber.ca
Chapters
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Transcript
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SPEAKER_01: Welcome to the Sleeping Baba podcast.
SPEAKER_02: We talk about how often marketing runs on comfort blankets. The things we all repeat because they're warm and everybody else is saying them and they feel good. And what we do here, in case you're new and you haven't heard these before, is we tend to cut them up and then look what's actually inside.
SPEAKER_00: Love that sound effect. Exactly. We're talking about real-world evidence. One idea and nothing in them you couldn't afford to your CFO, CMO, heck, the entire C-suite, but just BCC them so then it doesn't feel like you're attacking. Yeah.
