What are the differences/similarities/relation between the Prisoner's Dilemma vs Sucker Affect? My question stems from a senate hearing on Copyright law in which a proponent of a bill is envoking the "Free Rider" problem. Specifically, he is saying that if the NIH is to bypass copyright law by making research papers freely available to the public online, then non US taxpayers will then also benefit from the research on the taxpayer's dime. So, when looking up the free rider problem, I came across the term sucker affect/aversion - the definition of which sounds very similar to the Prisoner's dilemma. So my question is: What's the difference between the Prisoner's Dilemma and Sucker Affect?