AP Microeconomics - Basic Concepts & Fundamentals

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Scarcity

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Scarcity is the fundamental economic problem where human wants and needs are virtually unlimited, but the resources available to satisfy them are limited. It forces individuals and societies to make choices about how to allocate resources efficiently.

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Opportunity Cost

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The value of the next-best alternative that is foregone when a decision is made. It represents what you give up to get something else. For example, if you spend time studying, the opportunity cost is the time you could have spent sleeping.

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Rational Choice

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A decision-making process where individuals compare the marginal benefits (MB) of an action to its marginal costs (MC). A rational agent will only pursue an activity if the Marginal Benefit is greater than or equal to the Marginal Cost (MB >= MC).

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Marginal Analysis

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A decision-making tool used to examine the additional (incremental) benefit of an activity relative to its additional cost. Decisions are made 'at the margin,' such as deciding whether to consume one more unit of a good.

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The Production Possibilities Curve (PPC)

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A model illustrating the maximum possible combinations of two goods or services an economy can produce within a specific timeframe, assuming all resources are fully and efficiently employed. It demonstrates the concepts of scarcity, trade-offs, and efficiency.