The present study explores the effect of externalities awareness and Social Value Orientation (SVO) in anticommons dilemmas. Making participants of an anticommons game aware of externalities was...Show moreThe present study explores the effect of externalities awareness and Social Value Orientation (SVO) in anticommons dilemmas. Making participants of an anticommons game aware of externalities was expected to increase cooperation, by decreasing their willingnessto-accept (WTA) values, i.e. the amount they would be willing to accept in order to allow other individuals to make use of the resource. The results of the computer-based anticommons game (N = 167) did not support this hypothesis. However, the results did show, as predicted, that the more prosocial participants were, the more easily they allowed access to the resource by setting lower willingness-to-accept (WTA) values. Additionally, the hypothesized interaction effect between externalities awareness and Social Value Orientation (SVO) was not confirmed. Proselfs’ behavior did not change significantly more than prosocials’, after they got aware of the externalities. Finally, the negative effects of uncertainty in cooperation are discussed.Show less