The use of dichotomous choice questions (Are you willing to pay $x?) has been advocated as superior to open ended questions (What would you be willing to pay?) in contingent valuation studies of non-market goods. A supplementary dichotomous choice question, raising or lowering the bid price...

The use of dichotomous choice questions (Are you willing to pay $x?) has been advocated as superior to open ended questions (What would you be willing to pay?) in contingent valuation studies of non-market goods. A supplementary dichotomous choice question, raising or lowering the bid price...