Value estimates for environmental goods can be obtained by either estimating preference parameters as revealed through behavior related to some aspect of the amenity or using stated information concerning preferences for the good. In the environmental economics literature the stated preference...

We show in a public goods experiment on three continents that conditional cooperation is a universal behavioral regularity. Yet, the number of conditional cooperators and the extent of conditional cooperation are much higher in the U.S.A. than anywhere else. -- conditional cooperation ; public...