AP Microeconomics Flashcards: Marginal Analysis and Consumer Choice
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 19 cards to help you master important concepts.
At what point is the optimal quantity of consumption or production achieved?
The optimal quantity is achieved when the marginal benefit is equal to the marginal cost (MB = MC), or where total benefit is maximized.
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At what point is the optimal quantity of consumption or production achieved?
The optimal quantity is achieved when the marginal benefit is equal to the marginal cost (MB = MC), or where total benefit is maximized.
What is marginal analysis?
Marginal analysis involves comparing the additional benefit (marginal benefit) of an activity with its additional cost (marginal cost) to make a decision.
Besides MB = MC, what is another way to identify the optimal quantity?
The optimal quantity is the level of consumption or production where total benefit is maximized.
How does a consumer with a limited income decide how to allocate their money to maximize utility?
Consumers allocate their limited income to purchase the combination of goods that equates the marginal utility of the last dollar spent on each good.
When does a consumer stop reallocating their spending between different goods?
A consumer stops reallocating spending when the marginal utility per dollar spent is equal across all goods purchased, as this is the utility-maximizing point.
What is the primary goal of a rational consumer according to the model of consumer choice?
In a model of rational consumer choice, consumers are assumed to make choices that maximize their total utility.
What role do fixed costs (or sunk costs) play in determining the optimal quantity at a specific point in time?
The optimal quantity does not depend on fixed or sunk costs, as these have already been determined by past choices and cannot be recovered.
What is a sunk cost?
A sunk cost is a cost that has already been incurred and cannot be recovered; it should not influence future decisions made at the margin.
What are the key assumptions of consumer choice theory?
Consumer choice theory assumes that consumers are rational, have preferences, face budget constraints (limited income), and must pay prices for goods and services.
What is 'marginal utility'?
Marginal utility is the additional satisfaction or benefit a consumer gains from consuming one more unit of a good or service.
A firm can sell a product for $20. The marginal cost of producing one more unit is $25. Should the firm produce that unit?
No, the firm should not produce that unit because the marginal cost ($25) is greater than the marginal benefit (the $20 price).
How do constraints affect consumer decision making?
Consumers face constraints, like limited income, which force them to make optimal decisions by choosing the combination of goods that maximizes their utility.
Define diminishing marginal utility.
Diminishing marginal utility is the principle that as a consumer consumes more of a good or service, the additional satisfaction from each extra unit decreases.
How does a rational consumer use marginal benefits and marginal costs in their decision-making?
A rational consumer compares the marginal benefit and marginal cost of an action to decide whether to increase, decrease, or maintain their level of consumption.
A consumer is buying apples (A) and oranges (O). If MUa/Pa > MUo/Po, what should the consumer do to maximize utility?
The consumer should purchase more apples and fewer oranges, reallocating their spending toward the good that provides more marginal utility per dollar.
What is the utility-maximizing rule (in formula terms)?
To maximize utility, a consumer should choose a combination of goods where the ratio of marginal utility to price is equal for all goods (e.g., MUx/Px = MUy/Py).
If the marginal benefit (MB) of consuming another slice of pizza is greater than its marginal cost (MC), what should a rational consumer do?
The consumer should consume the additional slice of pizza because the extra benefit outweighs the extra cost.
If the marginal cost (MC) of an activity exceeds its marginal benefit (MB), what should an individual do?
The individual should decrease their level of that activity, as the additional cost is greater than the additional benefit.
You paid a $50 non-refundable fee for an all-you-can-eat buffet. How should this fee affect your decision to eat one more plate of food?
The $50 fee is a sunk cost and should not affect your decision. You should only compare the marginal benefit of eating more with the marginal cost (e.g., feeling unwell).