CLEP / Principles of Microeconomics
Free Practice Test: CLEP Principles of Microeconomics
Last updated: May 9, 2026
Start free practice exam →CLEP / Principles of Microeconomics
Last updated: May 9, 2026
Start free practice exam →Studying for the Principles of Microeconomics CLEP exam? Good move. The exam covers the kind of one-semester introductory microeconomics course taught at most colleges, with about 80 multiple-choice questions to answer in 90 minutes.
Microeconomics zooms in on the choices made by individual consumers, individual firms, and individual markets, in contrast to macroeconomics which looks at the economy as a whole. The bulk of the test (well over half) is on product markets: supply and demand, the theory of the firm, and how the four main market structures (perfect competition, monopolistic competition, oligopoly, and monopoly) shape outcomes. The rest covers basic concepts, factor markets (where labor and capital are bought and sold), and how government intervenes when markets fail.
Microeconomics is dominated by one giant section – product markets – with three smaller sections rounding out the rest. The College Board’s outline breaks the exam into four topic areas with the rough weights below.
The exam covers four main categories:
Like macro, micro starts from scarcity. Resources are finite and wants aren’t, so every choice has an opportunity cost. The production possibilities curve (PPC) makes this concrete: every point on the curve is an efficient combination of two goods, and moving along the curve forces a tradeoff.
Comparative advantage is the idea that even if one party can produce everything more efficiently, both parties still gain by specializing in what they’re relatively best at and trading. Be ready to compute opportunity costs for two producers and identify who has the comparative advantage in each good.
Finally, understand the role of prices and markets – how prices act as signals that coordinate the decisions of buyers and sellers without anyone being in charge. The whole rest of the exam builds on this foundation.
This is the heart of the exam. More than half your questions live here, so make sure the material is solid. There are four big subtopics.
Supply and demand. The classic upward-sloping supply curve and downward-sloping demand curve, with equilibrium where they cross. Know what shifts demand (income, preferences, prices of related goods, expectations, number of buyers) versus what shifts supply (input prices, technology, taxes, expectations, number of sellers). Be ready to work with consumer surplus and producer surplus, and to analyze the deadweight loss caused by price ceilings, price floors, taxes, or quotas.
Theory of consumer behavior. The law of diminishing marginal utility says that as a consumer gets more of a good, each additional unit gives them less satisfaction than the one before. The optimal bundle is where the marginal utility per dollar is equal across all goods. You may also see indifference curves and budget constraints.
Theory of the firm. Production, costs, and revenue. Understand the difference between fixed and variable costs in the short run, the law of diminishing returns to a variable input, and the standard cost curves (ATC, AVC, MC). On the revenue side, know the difference between total, average, and marginal revenue. Profit-maximizing firms produce where marginal revenue equals marginal cost (MR = MC).
Market structures. The four big ones are perfect competition (many small firms, identical products, free entry and exit; price equals MC in the long run, zero economic profit), monopoly (one seller, no close substitutes, deadweight loss from underproduction), monopolistic competition (many firms, differentiated products, some pricing power), and oligopoly (few firms, strategic interaction, often analyzed with game theory). Know which structures are efficient and which aren’t, and how each behaves in the long run.
Factor markets are where firms buy the inputs they need to produce: labor, capital, and natural resources. Demand for factors is derived from demand for the goods they help produce, which is why we call it derived demand.
The key concept is marginal revenue product (MRP) – the additional revenue a firm gets from hiring one more unit of a factor. Profit-maximizing firms hire factors up to the point where MRP equals the factor’s marginal cost (in a competitive labor market, that’s the wage rate).
Be ready for questions about labor markets specifically: what shifts labor demand and supply, the effect of minimum wages, and the role of unions or monopsony power. Distribution of income (how the total economic pie is divided across factors and households) often comes up here too.
Markets work well most of the time, but not always. Externalities are costs or benefits that spill over to people who aren’t part of the transaction. Negative externalities (pollution is the classic example) lead markets to overproduce; positive externalities (vaccinations, education) lead them to underproduce. Public policy responses include taxes (to internalize negative externalities), subsidies (to encourage positive ones), and direct regulation.
Public goods are non-rival and non-excludable (national defense is the textbook example) and tend to be underprovided by markets because of the free-rider problem.
Taxes are also covered here. Know the difference between progressive, proportional, and regressive taxes, and understand tax incidence – the fact that whoever legally pays a tax isn’t necessarily who economically bears its burden. Tax incidence depends on the relative elasticities of supply and demand.
Correct Answer: A. Both equilibrium price and quantity will increase
Explanation: When the demand curve shifts to the right and supply stays put, the new equilibrium occurs at a higher price and a higher quantity. Picture the diagram: demand moves up and right, intersecting the original supply curve at a point further up and to the right.
Correct Answer: A. 0.5 (relatively inelastic)
Explanation: Price elasticity of demand = % change in quantity demanded / % change in price = 5% / 10% = 0.5. When the absolute value is less than 1, demand is relatively inelastic, meaning quantity changes proportionally less than price. Necessities and goods with few substitutes typically have inelastic demand.
Correct Answer: C. Marginal utility decreases
Explanation: Each additional unit of a good gives the consumer less satisfaction than the one before it. Note that total utility usually still rises with each cup (just by less and less); it’s the marginal utility (the satisfaction from the next cup) that falls. Total utility actually falls only once marginal utility goes negative – the point at which the next cup makes things worse.
Correct Answer: B. Marginal revenue equals marginal cost
Explanation: The MR = MC rule applies to firms in every market structure. As long as MR exceeds MC, producing one more unit adds more to revenue than to cost, so the firm should keep producing. As soon as MC exceeds MR, the firm has gone too far. Profit is maximized exactly where they meet.
Correct Answer: C. Price equals minimum average total cost and economic profit is zero
Explanation: In perfect competition, free entry and exit drive long-run economic profit to zero. New firms enter when there’s profit, pushing price down; firms exit when there’s loss, pushing price up. Equilibrium settles where price equals minimum ATC. Firms still earn a normal return (zero economic profit doesn’t mean zero accounting profit), but no excess.
Correct Answer: B. Many firms selling differentiated products with relatively easy entry
Explanation: Monopolistic competition lives between perfect competition and monopoly. There are many firms (like in perfect competition), but they sell differentiated products and have some pricing power (like a monopoly). Restaurants, clothing brands, and hair salons are typical examples. Option A describes monopoly; option C describes oligopoly; option D describes perfect competition.
Correct Answer: B. A negative externality, leading to overproduction
Explanation: Pollution imposes costs on people who aren’t party to the transaction (a negative externality). Because the factory doesn’t bear the full social cost, it produces more than the socially optimal quantity. Public policy responses include corrective taxes (Pigouvian taxes), tradeable permits, or direct regulation to bring private cost in line with social cost.
Correct Answer: B. A derived demand based on the marginal revenue product of labor
Explanation: Firms don’t want labor for its own sake; they want labor because workers help produce goods that can be sold. So labor demand is derived from product demand. The specific number of workers a firm hires is determined by the marginal revenue product of labor (MRP), which is the additional revenue from hiring one more worker. Profit-maximizing firms hire up to MRP equals the wage rate.
Correct Answer: C. Non-rival in consumption and non-excludable
Explanation: Public goods have two defining traits. Non-rival means one person consuming the good doesn’t prevent another from consuming it (national defense protects you and your neighbor at the same time). Non-excludable means you can’t easily prevent someone from benefiting whether or not they paid (the lighthouse shines on every ship). These traits create the free-rider problem and explain why public goods are usually under-provided by markets.
Correct Answer: B. Fall mostly on consumers
Explanation: Tax incidence (who actually bears the burden of a tax) depends on relative elasticities, not on who legally writes the check. The side of the market with the more inelastic curve bears more of the burden because they have fewer alternatives. With highly inelastic demand and highly elastic supply, consumers can’t easily switch away, so they end up paying most of the tax through higher prices.
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