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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Behav Processes. 2019 Mar 12;162:157–161. doi: 10.1016/j.beproc.2019.03.006

Figure 1.

Figure 1.

Prototypic hyperbolic delayed reward discounting curves. The curves reflect the discounted subjective value of $100 delayed from 1 day to 1 year. The k values refer to the slopes of the two discounting curves. The k values are derived from the Mazur (1987) equation: V = A/(1 + kD), where V is the present value of the delayed reward A at delay D, and k is a free parameter that determines the discount rate. The higher one’s discount rate (k) is, the more they discount larger future rewards.