European Business Schools Librarian's Group

ESSEC Working Papers,
ESSEC Research Center, ESSEC Business School

No WP1207: The value of lies in an ultimatum game with imperfect information

Damien Besancenot (), Delphine Dubart () and Radu Vranceanu ()
Additional contact information
Damien Besancenot: CEPN
Delphine Dubart: ESSEC Business School, Postal: Avenue Bernard Hirsch - B.P. 50105, 95021 CERGY PONTOISE Cedex, FRANCE
Radu Vranceanu: ESSEC Business School, Postal: Avenue Bernard Hirsch - B.P. 50105, 95021 CERGY PONTOISE Cedex, FRANCE

Abstract: Humans often lie strategically. We study this problem in an ultimatum game involving informed proposers and uninformed responders, where the former can send an unverifiable statement about their endowment. If there are some intrinsically honest proposers, a simple message game shows that the rest of them are likely to declare a lower-than-actual endowment to the responders. In the second part of the paper, we report on an experiment testing this game. On average, 88.5% of the proposers understate the actual endowment by 20.5%. Regression analysis shows that a one-dollar gap between the actual and declared amounts prompts proposers to reduce their offer by 19 cents. However, responders appear not to take such claims seriously, and thus the frequency of rejections should increase. The consequence is a net welfare loss, that is specific to such a "free-to-lie" environment.

Keywords: Ultimatum game; Asymmetric information; Lying costs; Strategic lies; Deception; Welfare loss

JEL-codes: C91; D82; D83

31 pages, April 16, 2012

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