This paper addresses a current issue in environmental valuation, namely, th
e extent to which environmental preferences depart from the usual economic
paradigm to incorporate some lexicographic elements. After a theoretical di
scussion the paper reviews attempts to explore this question empirically by
supplementing contingent valuation analyses with an exploration of the mot
ives behind willingness-to-pay responses, including zero bids and refusals
to answer. This is followed by the presentation of new evidence investigati
ng respondents willingness to pay for the creation of a wetland taken from
713 personal interviews of the British public. (C) 2000 Elsevier Science B.
V. All rights reserved.