Willingness to pay
reservation price · price sensitivity · what someone will pay
The most a particular buyer would hand over rather than go without. It is a property of the buyer and their situation, not of the product, and it is the quantity every pricing decision is really about.
In practice
The same service is worth ten thousand dollars to a business losing forty thousand a month to the problem and two thousand to one that finds it mildly annoying. Nothing about the work differs.
The common mistake
Inferring it from what people say. Asked directly, buyers understate it, because the question makes them a negotiator. It is read from behavior — what they have paid before, what they bought instead, what happened when a price moved.
Every price sits between two numbers. Below the cost of providing the thing, the seller will not do it. Above what the buyer would pay rather than go without, the buyer will not buy. The price lands somewhere in that band, and the upper edge — willingness to pay — is the one businesses know least about.
The important thing about it is where it comes from. It is not a property of the product. It is a property of the buyer and the situation they are in, which means the same thing has a different ceiling for every person looking at it, and the ceiling can move without the product changing at all.
What sets it
The size of the problem. A firm losing $40,000 a month to something values fixing it differently from one losing $400. This is the largest factor and the one most often left unasked.
Urgency. The same problem is worth more in the week it becomes visible to a board than in the quarter it was first noticed. Nothing about the work changes; the buyer's alternatives have.
The alternatives. What they would do instead — a competitor, an internal hire, or nothing at all. Doing nothing is the most common alternative and the one sellers systematically forget to price against.
What it would cost them to be wrong. Buyers pay for risk reduction, which is why an unknown supplier and a known one can quote the same work and the known one closes higher without discussing quality.
What they are used to paying. Anchoring is real and lasting. A buyer who has always paid a day rate finds a fixed fee expensive at the same total cost.
Why asking does not work
Asked directly what they would pay, buyers answer as negotiators, because the question makes them one. The number that comes back is a bid, not a ceiling, and treating it as information is how a price gets set by the least informed party in the conversation.
What does carry information is behavior: what they currently spend on the problem, including internally; what they bought last time and from whom; whether they have tried and abandoned a cheaper option; how fast they moved when something else was urgent. This is revealed preference applied to a sales conversation, and it is more reliable than anything the buyer could tell you even if they wanted to.
The most useful single question is not about price at all. It is what happens if this does not get solved — and the length and specificity of that answer is roughly proportional to the ceiling.
What to do with it
Price against it, not against cost. Cost sets the floor and has no relationship to the ceiling. This is the argument behind value-based pricing, and willingness to pay is the quantity it is trying to estimate.
Expect it to vary, and build for that. If the ceiling differs by a factor of five across your buyers, one price is wrong for nearly all of them. Versions let buyers sort themselves without anyone having to guess — see price discrimination.
Select for it. The most reliable way to raise realized prices is not better negotiation; it is talking to buyers with larger problems. Willingness to pay is mostly set before the conversation starts, which makes it a segmentation question wearing a pricing costume.
Concept web
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What is willingness to pay?
The most a particular buyer would pay rather than go without. It is a property of the buyer and their situation rather than of the product, so the same thing has a different ceiling for every buyer.
How do you find out what someone will pay?
From behavior, not from asking. Asked directly, buyers answer as negotiators. What they currently spend on the problem, what they bought last time, and what happens if it goes unsolved are all more informative.
Why does willingness to pay vary so much?
Because it is set by the size of the problem, its urgency, the buyer's alternatives and the cost of being wrong — none of which are properties of what is being sold.