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Prospective memory refers to the ability to remember to perform a specific action at a specified future time. It is of particular importance in contexts of poverty, where individuals often have to keep track of important future actions, such as vaccinating children, without the benefit of reminder technologies. I present three studies on the shape of prospective memory as a function of time. In all studies, participants have to perform a simple action — sending a text message — at a specific time in the future — e.g. after 5 weeks — to obtain a monetary reward. In the first study, I find high rates of forgetting: For example, a reward worth 1.4 x the daily income is forgotten with 52 percent probability after 5 weeks. Forgetting is well-described by a power function. In the second study, when participants are discouraged from using their own reminders, forgetting is even stronger, but not by much. In the third study, participants overestimate their probability of remembering at long time horizons but underestimate it at short time horizons.
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