In The Selfish Gene, Dawkins (1976) proposed the existence of a unit of cultural inheritance that he called the meme. Some examples of memes are clothing fashions, tool designs, and architectural designs. Like genes, memes must share three properties: longevity, fecundity, and copying-fidelity. Longevity refers to the lifespan of a meme, fecundity to the rate of spread of a meme, and copying-fidelity to how accurately a meme is replicated. In other work (Hardisty and Cassill, in preparation), we hypothesized that (...) successful memes should share a fourth property with successful genes: memes should affect an organism’s lifetime fitness by improving survival or reproduction. Sterelny (2006) argued that high-fitness memes include tools or artifacts that are physically enduring, made from easy to find materials, and easy to reverse-engineer. Here, we argue that another way to link memes to individual fitness is to think of tools as part of an organism’s ecological niche. Each tool or artifact an organism makes that extends its evolutionary lifespan or increases its reproductive output is thus a meme that is directly contributing to that organism’s fitness. (shrink)

This paper proposes a novel account of why intertemporal decisions tend to display impatience: People pay more attention to the opportunity costs of choosing larger, later rewards than to the opportunity costs of choosing smaller, sooner ones. Eight studies show that when the opportunity costs of choosing smaller, sooner rewards are subtly highlighted, people become more patient, whereas highlighting the opportunity costs of choosing larger, later rewards has no effect. This pattern is robust to variations in the choice task, to (...) the participant population, and is observed for both incentivized and hypothetical choices. We argue that people are naturally aware of the opportunity costs associated with delayed rewards, but pay less attention to those associated with taking smaller, sooner ones. We conclude by discussing implications for theory and policy. (shrink)