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.

an aneroid barometer is different from a mercury barometer in that it provides readings that increase as air pressure increases.

hope it : )

i’m   sure probably just geuss and see which one you can get right, i’m pretty sure it is the combination of goods and services