Arational decision maker takes an action if and only if

A rational decision maker takes action if and only if the marginal benefit of the action exceeds the marginal cost.    

Explanation:

Rational people always think at the margin. Decision makers generally consider both the explicit and implicit costs of their actions.

The decision-making is the process of making choices in the optimal level of benefit or utility for an individual. Rational decision making is a multi-step process that makes choices between the alternatives.

A rational decision maker takes action if and only if the marginal benefit of the action exceeds the marginal cost.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.