Economic Agents and Their Goals
Idea
Three economic agents make the choices that allocate scarce resources, each pursuing its own goal. Identifying the agent and its goal is the foundation of any rational-decision-making analysis, because what counts as a benefit or a cost is defined relative to that goal.
Mechanism
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Consumers aim to maximise utility — the satisfaction gained from consuming goods and services. They exchange limited income for the consumption that yields the most satisfaction.
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Producers (firms) aim to maximise profit — they organise resources into goods and services and sell them for the greatest surplus of revenue over cost.
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The government aims to maximise social welfare — it uses policy and expenditure to raise the well-being of society as a whole.
Together these are the three microeconomic goals. The same agents reappear in macroeconomics pursuing economy-wide objectives.
Considerations
A benefit is whatever advances an agent’s goal; a cost is whatever sets it back. So a consumer weighs utility, a firm weighs profit, and a government weighs net social welfare — including the opportunity cost of public funds. Reading a question’s agent correctly is what makes a cost–benefit point relevant rather than generic.