Two versions of the Personal Orientation Inventory were administered to 317 subjects. One version employed the standard two-choice response format. The other version used a six-choice response format. The purpose of this study was (1) to determine if a multiple-response format resulted in improved psychometric properties, (2) to compare the component structure of the two versions, and (3) to co...

Seceral contingent caluation studies hace found that the open-ended format yields lower estimates of willingness to pay (WTP) than does the closed-ended, or dichotomous choice, format. In this study, WTP for a public encironmental good was estimated under four conditions: actual payment in response to open-ended and closed-ended requests, and hypothetical payment in response to open-ended and c...