Huw Dixon later argues that it may not be necessary to analyze in detail the process of reasoning underlying bounded rationality. If we believe that agents will choose an action that gets them "close" to the optimum, then we can use the notion of "epsilon-optimization", which means we choose our actions so that the payoff is within epsilon of the optimum. If we define the optimum (best possible) payoff as formula_1, then the set of epsilon-optimizing options S(ε) can be defined as all those options s such that: