Willingness to pay (WTP) is the maximum price at or below which a consumer will definitely buy one unit of a product. This corresponds to the standard economic view of a consumer reservation price. Some researchers, however, conceptualize WTP as a range. Willingness to pay (WTP) is the maximum price at or below which a consumer will definitely buy one unit of a product. This corresponds to the standard economic view of a consumer reservation price. Some researchers, however, conceptualize WTP as a range.