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Making the Seemingly Impossible Appear Possible: Effects of Conjunction Fallacies in Evaluations of Bets on Football Games
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
Stockholm School of Economics.
2010 (English)In: Journal of Economic Psychology, ISSN 0167-4870, Vol. 31, no 2, 172-180 p.Article in journal (Refereed) Published
Abstract [en]

This paper investigates whether people obey the conjunction rule when evaluating predictions concerning the outcomes of football games. The conjunction rule states that if event A and event B are two independent events, the probability that both events A and B will occur cannot be greater than the probability that A will occur. Hence, the prediction that AC Milan will beat Fiorentina at the same times as Juventus will beat Lecce cannot be more likely than the prediction that AC Milan will beat Fiorentina. In an empirical study, it was shown that people frequently violated the conjunction rule. When a prediction with a low or intermediate likelihood of success (e.g., Stoke City will beat Manchester United) was combined with one or two predictions that had high likelihood of success (e.g., Liverpool FC will beat Wigan), it was perceived to be more likely to happen than when it was presented alone. This was not true when it was combined with a prediction with a low likelihood of success. Thus, the perceived likelihood of a particular prediction is dependent on the context in which it is presented.

Place, publisher, year, edition, pages
Elsevier , 2010. Vol. 31, no 2, 172-180 p.
Keyword [en]
Betting, conjunction fallacy, context effects, probability judgment
National Category
URN: urn:nbn:se:uu:diva-121367DOI: 10.1016/j.joep.2009.07.003ISI: 000276765200003OAI: oai:DiVA.org:uu-121367DiVA: diva2:305053
Available from: 2010-03-22 Created: 2010-03-22 Last updated: 2014-11-26

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