Document de travail Continuous Preferences Can Cause Discontinuous Choices : an Application to the Impact of Incentives on Altruism Paul Seabright IDEI Working Paper n° 257, 2004 RéférencePaul Seabright, « Continuous Preferences Can Cause Discontinuous Choices : an Application to the Impact of Incentives on Altruism », IDEI Working Paper, n° 257, 2004.