Nash Equilibrium Don't Always Model Reality!
http://web.mit.edu/newsoffice/2009/game-theory.html is an excellent article about game theory, and why Nash equilibrium don't model reality when the game is "hard." Hard is this case is like a problem being NP complete but unlike NP complete there is always a solution. In game theory the solution is the Nash equilibrium, which is proven to always exist. Thus, the finding such an equilibrium is known as an PPAD-complete.
Posted by Tim Henderson
