Indeed, the proposition is that people act rationally and maximize their total satisfaction when making decisions.
Rational behavior is a decision-making process that results to optimal benefits or utility for the decision-maker. The assumption of rational behavior implies that decision-makers make choices to benefit them above the marginal costs of such decisions.
Thus, people who spend 30 days per year in commuting actually fulfill the rational assumption, because they derive maximum marginal benefits visa-a-vis commuting more or less than 30 days annually.
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