I'll admit that it might be a little more complicated than that. Does life require that we make default assumptions? Is the default assumption that when we are seeing and playing a game for the first time, we should assume that the other players are following the simplest and most impartial strategy that can explain their behavior a good default assumption? Implicit default assumptions are rampant in human efforts to resolve the hard problems of life. Can anyone recommend ways to identify them, to find alternative default assumptions, choose good ones, and to be aware of their impact on conclusions.