Doyle's (2013) theoretical survey of discount functions criticizes two parametric families abbreviated as CRDI and CADI families. We show that Doyle's criticisms are based on a mathematical mistake and are incorrect.

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Judgment and Decision Making
Erasmus School of Economics

Bleichrodt, H., Potter van Loon, R., Rohde, K., & Wakker, P. (2013). A criticism of Doyle's survey of time preference: A correction regarding the CRDI and CADI families. Judgment and Decision Making, 8(5), 630–631. Retrieved from