Working paper Continuous Preferences Can Cause Discontinuous Choices : an Application to the Impact of Incentives on Altruism Paul Seabright IDEI Working Paper n. 257, 2004 ReferencePaul Seabright, “Continuous Preferences Can Cause Discontinuous Choices : an Application to the Impact of Incentives on Altruism”, IDEI Working Paper, n. 257, 2004.