We assume that every people has reasonably simple objectives and choose the correct means to achieve them.
Rationality is an assumption about individual, not about group (think about the prisoner's dilemma)
*rational ignorance: it is rational to be ignorant when the information costs more than it is worth.
Rational behavior (in the sense of "making the right decision") requires information. If that information is itself costly, rational behavior consists of acquiring information (paying information costs) only as long as the return from additional information is at least as great as the cost of getting it.
Rationality is not the same as the assumption that people reason logically. Logical reasoning is not the only, or even the most common, way of getting a correct answer. Since there're rationality with no mind to reason with. (computers that can learn)
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