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In game theory, 'guess 2/3 of the average' is a game where several people guess what 2/3 of the average of their guesses will be, and where the numbers are restricted to the real numbers between 0 and 100, inclusive. The winner is the one closest to the 2/3 average.

Equilibrium analysis[edit]

In this game there is no strictly dominant strategy. However, there is a unique pure strategyNash equilibrium. This equilibrium can be found by iterated elimination of weakly dominated strategies. Guessing any number that lies above 66+2/3 is weakly dominated for every player since it cannot possibly be 2/3 of the average of any guess. These can be eliminated. Once these strategies are eliminated for every player, any guess above 44+4/9 is weakly dominated for every player since no player will guess above 66+2/3, and 2/3 of 66+2/3 is 44+4/9. This process will continue until all numbers above 0 have been eliminated. All players selecting 0 also happens to be the Pareto optimal solution.

This degeneration does not occur in quite the same way if choices are restricted to, for example, the integers between 0 and 100. In this case, all integers except 0 and 1 vanish; it becomes advantageous to select 0 if one expects that at least 1/4 of all players will do so, and 1 otherwise. (In this way, it is a lopsided version of the so-called 'consensus game', where one wins by being in the majority.)

Experimental results[edit]

This game is a common demonstration in game theory classes, where even economics graduate students fail to guess 0.^[1] When performed among ordinary people it is usually found that the winner's guess is much higher than 0: 21.6 was the winning value in a large online competition organized by the Danish newspaper Politiken. 19,196 people participated and the prize was 5000 Danish kroner.^[2]

Rationality versus common knowledge of rationality[edit]

This game illustrates the difference between perfect rationality of an actor and the common knowledge of rationality of all players. Even perfectly rational players playing in such a game should not guess 0 unless they know that the other players are rational as well and that all players' rationality is common knowledge. If a rational player reasonably believes that other players will not follow the chain of elimination described above, it would be rational for him/her to guess a number above 0.

We can suppose that all the players are rational, but they do not have common knowledge of each other's rationality. Even in this case, it is not required that every player guess 0, since they may expect each other to behave irrationally.

History[edit]

Alain Ledoux is the founding father of the guess 2/3 of the average-game. In 1981, Ledoux used this game as a tie breaker in his French magazine Jeux et Stratégie. He asked about 4,000 readers, who reached the same number of points in previous puzzles, to state an integer between 1 and 1,000,000,000. The winner was the one who guessed closest to 2/3 of the average guess.^[3] Rosemarie Nagel (1995) revealed the potential of guessing games of that kind: They are able to disclose participants' 'depth of reasoning.' Due to the analogy to Keynes's comparison of newspaper beauty contests and stock market investments^[4] the guessing game is also known as the Keynesian beauty contest.^[5] Rosemarie Nagel's experimental beauty contest became a famous game in experimental economics. The forgotten inventor of this game was unearthed in 2009 during an online beauty contest experiment with chess players provided by the University of Kassel:^[6] Alain Ledoux, together with over 6,000 other chess players, participated in that experiment which looked familiar to him.^[7][8]

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See also[edit]

Notes[edit]

1. ^Nagel, Rosemarie (1995). 'Unraveling in Guessing Games: An Experimental Study'. American Economic Review. 85 (5): 1313–26. JSTOR2950991.
2. ^Schou, Astrid (22 September 2005). 'Gæt-et-tal konkurrence afslører at vi er irrationelle'. Politiken (in Danish). Retrieved 29 August 2017. Includes a histogram^{[permanent dead link]} of the guesses. Note that some of the players guessed close to 100. A large number of players guessed 33.3 (i.e. 2/3 of 50), indicating an assumption that players would guess randomly. A smaller but significant number of players guessed 22.2 (i.e. 2/3 of 33.3), indicating a second iteration of this theory based on an assumption that players would guess 33.3. The final number of 21.6 was slightly below this peak, implying that on average each player iterated their assumption 1.07 times.
3. ^Ledoux, Alain (1981). 'Concours résultats complets. Les victimes se sont plu à jouer le 14 d'atout' [Competition results complete. The victims were pleased to play the trump 14]. Jeux & Stratégie (in French). 10: 10–1.
4. ^Keynes, John M. (1936). The General Theory of Interest, Employment and Money. London: Macmillan. p. 156.
5. ^Duffy, John; Nagel, Rosemarie (1997). 'On the Robustness of Behaviour in Experimental 'Beauty Contest' Games'. The Economic Journal. 107 (445): 1684. doi:10.1111/j.1468-0297.1997.tb00075.x. JSTOR2957901. S2CID153447786.
6. ^Bühren, Christoph; Frank, Björn (2010). 'Chess Players Performance Beyond 64 Squares: A Case Study on the Limitations of Cognitive Abilities Transfer'(PDF). MAGKS Joint Discussion Paper Series in Economics. 19-2010.
7. ^Bühren, Christoph; Frank, Björn; Nagel, Rosemarie (2012). 'A Historical Note on the Beauty Contest'(PDF). MAGKS Joint Discussion Paper Series in Economics. 11-2012.
8. ^Nagel, Rosemarie; Bühren, Christoph; Frank, Björn (2016). 'Inspired and inspiring: Hervé Moulin and the discovery of the beauty contest game'(PDF). Mathematical Social Sciences. 90: 191–207. doi:10.1016/j.mathsocsci.2016.09.001.

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