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Does time inconsistency differ between gain and loss? An intra-personal comparison using a non-parametric elicitation method

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  • Shotaro Shiba

    (Waseda University)

  • Kazumi Shimizu

    (Waseda University)

Abstract

Several studies on time preference have found time inconsistency in both gain and loss preferences. However, the relationship between the two within the same person remains unclear; that is, does an individual who demonstrates time inconsistency for gain outcomes do so for losses as well? This paper reports on individuals’ time inconsistency for gains and losses in a laboratory setting. To obtain a precise comparison of individuals’ time inconsistency for gains and losses, we used Rohde’s “DI (decreasing impatience)-index” (Manag Sci 65(4):1700–1716, 2018) and measured the level of time inconsistency, rather than merely identifying whether TI was present. This index represents how strongly a person exhibits present bias, and easily extends to the comparison between gain and loss preferences within the same person. Further, it allows the experiment to test for so-called future bias, which has been a focus area in recent time inconsistency literature. It is elicited through a non-parametric method, which avoids any specification errors in the analysis. Our findings are as follows: first, we found future bias in preferences for not only gains but also losses, and we confirmed that this tendency is consistent with previous findings on preferences for gains. Second, a positive correlation between time inconsistency for gains and losses was found at the individual level. Indeed, we could not find a significant difference between the two in most cases.

Suggested Citation

  • Shotaro Shiba & Kazumi Shimizu, 2020. "Does time inconsistency differ between gain and loss? An intra-personal comparison using a non-parametric elicitation method," Theory and Decision, Springer, vol. 88(3), pages 431-452, April.
    • Handle: RePEc:kap:theord:v:88:y:2020:i:3:d:10.1007_s11238-019-09728-1
    DOI: 10.1007/s11238-019-09728-1
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    Cited by:

    1. Stefan A Lipman & Arthur E Attema, 2020. "Good things come to those who wait—Decreasing impatience for health gains and losses," PLOS ONE, Public Library of Science, vol. 15(3), pages 1-15, March.

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