Money's Primary Role as a Medium of Exchange

Steps:

• Recall the three main functions of money: medium of exchange, unit of account, and store of value.
• Evaluate each option against these functions to identify the direct match.
• Eliminate options that describe properties or unrelated concepts, not core functions.
• Confirm the best fit based on economic definitions.

Why A is correct:

• Money functions as a medium of exchange by facilitating transactions without the need for barter, as defined in standard economic theory.

Why the others are wrong:

• B describes a desirable property of money for practicality, not a core function.
• C is incorrect because money eliminates the need for bartering by providing a standardized alternative.
• D refers to money's store of value function, but it fails during high inflation, so it's not a reliable function.

Final answer: A