This paper investigates the idea that people are unsure about the value they place on prospective changes in environmental goods. In particular, we focus on a parametric explanation of the determinants of a "value gap," the difference between the most someone is sure they would pay for an...

"In contingent valuation, despite the fact that many externalities manifest themselves as costs to some and benefits to others, most studies restrict willingness to pay to being non-negative. In this paper, we investigate the impact of allowing for negative, zero and positive preferences for...