HEC Research Papers Series,
HEC Paris

Abstract: Overconfident behavior, the excessive willingness to bet on one’s performance, may be driven by optimistic beliefs and/or ambiguity attitudes. Separating these factors is key for understanding and correcting overconfident behavior, as they may call for different corrective actions. We present a method to do so, which we implement in two incentivized experiments. The first experiment shows the importance of ambiguity attitudes for overconfident behavior. Optimistic ambiguity attitudes (ambiguity seeking) counterbalanced the effect of pessimistic beliefs, leading to neither over- nor underconfident behavior. The second experiment applies our method in contexts where overconfident behavior is expected to vary: easy vs. hard tasks. Our results showed that task difficulty affected both beliefs and ambiguity attitudes. However, while beliefs were more optimistic for relative performance (rank) and more pessimistic for absolute performance (score) on easy tasks compared to hard tasks, ambiguity attitudes were always more optimistic on easy tasks for both absolute and relative performance. Our findings show the subtle interplay between beliefs and ambiguity attitudes: they can reinforce or offset each other, depending on the context, increasing or lowering overconfident behavior.

Keywords: overconfidence; subjective expected utility; beliefs measurement; ambiguity attitudes; hard-easy effect.

JEL-codes: D81; D83; D91

32 pages, May 23, 2023

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