One-Switch Discount Functions

Nina Anchugina

Papers from arXiv.org

Abstract: Bell (1988) introduced the one-switch property for preferences over sequences of dated outcomes. This property concerns the effect of adding a common delay to two such sequences: it says that the preference ranking of the delayed sequences is either independent of the delay, or else there is a unique delay such that one strict ranking prevails for shorter delays and the opposite strict ranking for longer delays. For preferences that have a discounted utility (DU) representation, Bell (1988) argues that the only discount functions consistent with the one-switch property are sums of exponentials. This paper proves that discount functions of the linear times exponential form also satisfy the one-switch property. We further demonstrate that preferences which have a DU representation with a linear times exponential discount function exhibit increasing impatience (Takeuchi (2011)). We also clarify an ambiguity in the original Bell (1988) definition of the one-switch property by distinguishing a weak one-switch property from the (strong) one-switch property. We show that the one-switch property and the weak one-switch property definitions are equivalent in a continuous-time version of the Anscombe and Aumann (1963) setting.

Date: 2017-02
New Economics Papers: this item is included in nep-mic and nep-upt
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