The Evolution of Lying in Well-Mixed Populations

Journal of the Royal Society Interface 16, 20190211 (2019)

10 Pages Posted: 5 Aug 2019 Last revised: 7 Aug 2019

See all articles by Valerio Capraro

Valerio Capraro

Middlesex University

Matjaz Perc

Faculty of Natural Sciences and Mathematics, University of Maribor

Daniele Vilone

Italian National Research Council (CNR) - Institute of Cognitive Sciences and Technologies (ISTC)

Date Written: July 31, 2019

Abstract

Lies can have profoundly negative consequences for individuals, groups, and even for societies. Understanding how lying evolves and when it proliferates is therefore of significant importance for our personal and societal well-being. To that effect, we here study the sender-receiver game in well-mixed populations with methods of statistical physics. We use the Monte Carlo method to determine the stationary frequencies of liars and believers for four different lie types. We consider altruistic white lies that favor the receiver at a cost to the sender, black lies that favor the sender at a cost to the receiver, spiteful lies that harm both the sender and the receiver, and Pareto white lies that favor both the sender and the receiver. We find that spiteful lies give rise to trivial behavior, where senders quickly learn that their best strategy is to send a truthful message, whilst receivers likewise quickly learn that their best strategy is to believe the sender’s message. For altruistic white lies and black lies, we find that most senders lie while most receivers do not believe the sender’s message, but the exact frequencies of liars and non-believers depend significantly on the payoffs, and they also evolve non-monotonically before reaching the stationary state. Lastly, for Pareto white lies we observe the most complex dynamics, with the possibility of both lying and believing evolving with all frequencies between 0 and 1 in dependence on the payoffs. We discuss the implications of these results for moral behavior in human experiments.

Keywords: lying, dishonesty, honesty, evolution, statistical physics, Monte Carlo method

JEL Classification: C00, C02, C60, C63, C70, C71, C72, C73, D00, D01, D63, D64, D74

Suggested Citation

Capraro, Valerio and Perc, Matjaz and Vilone, Daniele, The Evolution of Lying in Well-Mixed Populations (July 31, 2019). Journal of the Royal Society Interface 16, 20190211 (2019), Available at SSRN: https://ssrn.com/abstract=3429716

Valerio Capraro (Contact Author)

Middlesex University ( email )

The Burroughs
London, NW4 4BT
United Kingdom

Matjaz Perc

Faculty of Natural Sciences and Mathematics, University of Maribor ( email )

Koroska cesta 160
Maribor, SI-2000
Slovenia

HOME PAGE: http://www.matjazperc.com/

Daniele Vilone

Italian National Research Council (CNR) - Institute of Cognitive Sciences and Technologies (ISTC) ( email )

Viale Marx 15
Roma, RM 00137
Italy

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