The encyclopedia · R&D & Science · Product decision · 2010–2011
The all-you-can-eat buffet's flat price changes how much people eat
A field experiment showed a 50% buffet discount cut consumption 27.9% — flat-rate pricing makes diners eat to get their money's worth.
All-you-can-eat pizza restaurant
The solution
All-you-can-eat buffets face a pricing puzzle: the customer pays once for unlimited food, so the merchant cannot meter consumption, and the customer's appetite is unknown in advance. The flat rate solves the transaction problem — no per-item pricing, no weighing plates — but it also changes how people eat.
Economists David Just and Brian Wansink ran a field experiment at an all-you-can-eat pizza restaurant: when the price of the meal was discounted 50%, customers consumed 27.9% less pizza — 2.95 pieces instead of 4.09. Paying less made people eat less, not more.
Their interpretation: in a flat-rate context, diners eat until they feel they got their money's worth, not until they are full. The fixed price becomes an anchor for how much value to extract. The finding explains both why buffets thrive as a business model — fixed revenue per diner, no costly metering — and why their economics depend on how the price shapes the diner's sense of the deal.
Why it worked
- Flat pricing removes the cost of metering consumption
- The price anchors how much 'value' diners feel they must extract
- A 50% discount cut consumption by 27.9%, proving the anchor effect
- The mechanism explains buffet profitability and overeating alike
What can be applied
Flat-rate pricing does more than charge a fee: it changes how customers value the experience — price anchors consumption, so design the flat rate knowing it shapes how much people use the service.
Aftermath
The paper became a standard reference in behavioral pricing and was widely cited in research on subscription and flat-rate services, where the same money's-worth logic shapes how much people use gyms, data plans and streaming.
Sources
- The Flat-Rate Pricing Paradox: Conflicting Effects of 'All-You-Can-Eat' Buffet Pricing
- The Flat-Rate Pricing Paradox: Conflicting Effects of 'All-You-Can-Eat' Buffet Pricing
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