We report results from an on-line economics experiment that examines the eﬀect of nudging retirement savings decisions. In the experiments, participants make decisions in a ﬁnitely repeated retirement savings game, in which income during working years is uncertain, and retire-ment age is known. Participants, who are household ﬁnancial decision-makers, are nudged with automatic savings in each period of the game. We ﬁnd that that the nudge simply replaced nat-ural decision-making observed in the absence of a nudge in this experiment, even to the extent that it resulted in nearly identical inferred decision rules. This surprising result highlights the unpredictability of the eﬀect of nudging human behavior.
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