Customer Willingness-to-Pay Survey: Practical Question Design for Restaurants

In March 2025, an 80-table Trabzon-cuisine restaurant in Van's Mercan Valley embedded a tiny 4-question survey into their QR menu before raising the lamb tandoor price to ₺480. From 1100 responses, the optimal price band emerged as ₺425-510. The survey was anonymous, fast, free — and replaced guesswork with decision data.

The Van Westendorp Logic

The Van Westendorp Price Sensitivity Meter is a 1976 technique. It does not ask "how much would you pay?" directly. Instead, it probes the same product from 4 different angles. The intersections of those 4 curves reveal the "acceptable band."

Questions run in this order: "Below what price would you suspect the quality?" / "Below what price is it a bargain that still has value?" / "Above what price does it feel expensive but you'd still consider?" / "Above what price would you definitely walk away?". The sequence is intentional — moving from cheap to expensive defuses anchoring.

Adapting for Restaurants

In a restaurant context, these 4 questions need to be different from the academic template. The guest is at the table, pre-order, with low cognitive bandwidth.

• Target one dish — ask about "lamb tandoor", not "your menu". Abstract responses are useless.
• 5 price points — radio button, not slider. e.g. 350, 425, 500, 575, 650. Sliders cause fatigue.
• Single screen, 30 seconds — long surveys drop completion to 12%. Target ≥65% completion.

Common Pitfalls

First pitfall: sample bias. If the survey lives only inside the QR menu, you only hear from guests who already showed up. Solution: parallel Instagram story poll, SMS to lapsed guests from last month with the same 4 questions.

Second pitfall: question order. Asking "expensive" first anchors the user's mind on the expensive side. Stay loyal to Van Westendorp's original sequence.

Third pitfall: interpretation. The Optimal Price Point (OPP) is not used alone — it is read with the Indifference Price Point (IPP). The Van restaurant found IPP at ₺465 and set the final price at ₺480 — slightly above IPP, preserving the "I'm getting value" feeling.

FAQ

How many responses are enough? 300 minimum, 1000+ ideal for statistical confidence. The Van restaurant collected 1100 in 6 weeks.

Should I survey every dish? No. 2-3 anchor dishes per year. Others can be estimated via cross-elasticity.

Should I offer a survey incentive? If you give one (e.g. 5% coupon), show it AFTER the survey, not as a prompt. Otherwise it biases responses.

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