sentence1: Apparently nobody told him that equilibrium thinking--the idea that in order to understand how individuals interact, it is often useful to ask what would happen if each individual was doing the best he or she could given what everyone else is doing--is almost as prevalent in . In fact, the really funny thing is that for the most part the bionomics program has already been  Economics already is very similar to evolutionary theory, and vice versa.
sentence2: Equilibrium thinking is where two people bounce ideas off each other until they agree on an answer.