 The value of "p" which makes these two expected values equal is the risk factor for the equilibrium (H, H), with formula_3 the risk factor for playing (G, G).You can also calculate the risk factor for playing (G, G) by doing the same calculation, but setting "p" as the probability the other player will play G. An interpretation for "p" is it is the smallest probability that the opponent must play that strategy such that the person's own payoff from copying the opponent's strategy is greater than if the other strategy was played.A number of evolutionary approaches have established that when played in a large population, players might fail to play the payoff dominant equilibrium strategy and instead end up in the payoff dominated, risk dominant equilibrium.