Social scientists have long studied traps where each individual does what she thinks is best for herself (such as overfishing in a local pond), even though, when everyone makes the same choice, it leads to a bad outcome for all (the pond stops producing any fish). If the group could coordinate (such as by setting a limit on how many fish each resident can take), the long-term outcome would be far more fish for everyone. These traps are called collective action problems (or sometimes social dilemmas).
