AP Microeconomics Vocabulary

Absolute Advantage

The ability of a producer to make a good or service using fewer resources than another producer.

Example: "Country A has an          in wheat production because it can produce 100 bushels per acre compared to Country B's 60 bushels per acre."

Accounting Profit

Total revenue minus explicit costs only, without considering implicit costs such as opportunity costs.

Similar definitions: book profit

Example: "The firm's          was $200,000 after subtracting wages, rent, and materials from total revenue."

Allocative Efficiency

A state in which resources are distributed so that price equals marginal cost, ensuring goods are produced in the quantities most desired by society.

Example: "A perfectly competitive market achieves          because firms produce where P = MC."

Antitrust Laws

Government regulations designed to promote competition and prevent monopolies from engaging in anti-competitive practices such as price-fixing, market allocation, and mergers that reduce competition.

Example: "The government used          to block the merger of two major airlines because it would have significantly reduced competition."

Asymmetric Information

A market failure that occurs when one party in a transaction has more or better information than the other, leading to adverse selection or moral hazard.

Example: "The used car market suffers from          because sellers know more about the car's condition than buyers do."

Average Fixed Cost (AFC)

Total fixed cost divided by the quantity of output produced; it continuously declines as output increases because the fixed cost is spread over more units.

Example: "As the factory produced more units, the          fell because the same rent was spread across a larger number of goods."

Average Product

Total output divided by the total quantity of a specific input used, measuring the per-unit productivity of that input.

Example: "If 10 workers produce 500 widgets, the          of labor is 50 widgets per worker."

Average Total Cost (ATC)

Total cost divided by the quantity of output produced; the sum of average fixed cost and average variable cost.

Similar definitions: unit cost, per-unit cost

Example: "The firm's          was minimized at 200 units of output, representing its most efficient scale of production."

Average Variable Cost (AVC)

Total variable cost divided by the quantity of output produced; it initially falls and then rises due to diminishing marginal returns.

Example: "The firm should shut down in the short run if the market price falls below its minimum         ."

Barriers to Entry

Obstacles such as high startup costs, patents, control of resources, or government regulations that make it difficult for new firms to enter a market.

Example: "The pharmaceutical industry has significant          because developing new drugs requires enormous research investment and regulatory approval."

Break-Even Point

The level of output at which a firm's total revenue equals total cost, resulting in zero economic profit; occurs at the minimum point on the average total cost curve.

Example: "At the         , the firm earns just enough revenue to cover all its costs, including a normal profit."

Budget Constraint

A line on a graph showing all the combinations of two goods a consumer can afford given their income and the prices of the goods.

Similar definitions: budget line

Example: "When the price of pizza fell, the student's          shifted outward along the pizza axis, allowing more consumption possibilities."

Capital

Human-made resources such as machinery, tools, equipment, and buildings used in the production of goods and services.

Similar definitions: physical capital

Example: "The factory invested in new          like robotic assembly lines to increase productivity."

Cartel

A formal agreement among competing firms in an oligopoly to coordinate prices and output in order to maximize joint profits.

Example: "OPEC is an example of a          in which oil-producing nations agree to limit production to keep prices high."

Ceteris Paribus

A Latin phrase meaning "all other things being equal," used in economics to isolate the effect of one variable while holding all others constant.

Example: "        , an increase in the price of coffee will lead to a decrease in the quantity demanded of coffee."

Change in Demand

A shift of the entire demand curve caused by a change in a non-price determinant (income, tastes, prices of related goods, expectations, or number of buyers), as opposed to a movement along the curve.

Example: "A news report about the health benefits of blueberries caused a         , shifting the demand curve to the right."

Change in Quantity Demanded

A movement along the demand curve caused by a change in the price of the good itself, not a shift of the curve.

Example: "When the price of laptops fell from $1,000 to $800, there was a         , but the demand curve itself did not shift."

Change in Quantity Supplied

A movement along the supply curve caused by a change in the price of the good itself, not a shift of the curve.

Example: "When the price of corn rose, farmers experienced a          as they moved along the existing supply curve to produce more."

Change in Supply

A shift of the entire supply curve caused by a change in a non-price determinant (input costs, technology, expectations, number of sellers, taxes/subsidies, or regulations), as opposed to a movement along the curve.

Example: "A new technology that reduced manufacturing costs caused a         , shifting the supply curve to the right."

Circular Flow Model

A simplified diagram showing how money, goods, services, and resources flow between households, firms, and government in an economy.

Example: "The          illustrates how households supply labor to firms and receive wages, which they then spend on goods and services."

Club Goods

Goods that are excludable but non-rivalrous, meaning access can be restricted to those who pay, but one person's use does not diminish another's.

Similar definitions: artificially scarce goods

Example: "A streaming service is a          because only subscribers can access the content, but one viewer does not reduce availability for others."

Coase Theorem

The idea that if property rights are well-defined and transaction costs are low, private parties can negotiate to correct an externality without government intervention.

Example: "According to the         , a factory and nearby residents could negotiate a solution to pollution without needing a government regulation."

Collusion

A secret or illegal agreement among competing firms to fix prices, limit output, or divide markets in order to increase profits.

Example: "The two airlines engaged in          by agreeing to charge identical fares on competing routes."

Command Economy

An economic system in which a central authority, usually the government, makes all major decisions about the production and distribution of goods and services.

Similar definitions: planned economy, centrally planned economy

Example: "In a         , the government determines what goods are produced, how they are produced, and who receives them."

Common Resources

Goods that are non-excludable but rivalrous in consumption, meaning anyone can use them but one person's use diminishes availability for others.

Similar definitions: common-pool resources

Example: "Ocean fish stocks are          because no one can be prevented from fishing, but overfishing depletes the supply for everyone."

Comparative Advantage

The ability of a producer to make a good or service at a lower opportunity cost than another producer, forming the basis for mutually beneficial trade.

Example: "Even though the United States can produce both cars and wheat more efficiently, it has a          in cars if its opportunity cost of producing cars is lower."

Complementary Goods

Goods that are typically consumed together, so an increase in the price of one leads to a decrease in demand for the other.

Similar definitions: complements

Example: "Hot dogs and hot dog buns are         ; when the price of hot dogs rises, the demand for buns decreases."

Constant Returns to Scale

A condition in which increasing all inputs by a certain proportion results in output increasing by that same proportion.

Example: "The firm experienced          when doubling all of its inputs exactly doubled its output."

Consumer Surplus

The difference between the maximum price a consumer is willing to pay for a good and the actual market price paid; represented by the area below the demand curve and above the price.

Example: "A buyer willing to pay $50 for a shirt that costs $30 receives $20 in         ."

Cross-Price Elasticity of Demand

A measure of the responsiveness of the quantity demanded of one good to a change in the price of another good; positive for substitutes and negative for complements.

Example: "The          between Coke and Pepsi is positive because they are substitutes."

Deadweight Loss

The reduction in total economic surplus (consumer plus producer surplus) that results from a market inefficiency, such as taxes, price controls, or monopoly pricing.

Example: "The government tax on cigarettes created a          because the quantity traded fell below the socially optimal level."

Demand

The quantity of a good or service that consumers are willing and able to purchase at various prices during a given period of time, shown graphically as a downward-sloping demand curve.

Example: "The          for electric vehicles increased as gas prices rose and consumer preferences shifted toward sustainability."

Derived Demand

Demand for a factor of production that arises from the demand for the final good or service it helps produce.

Example: "The          for steel increased when the demand for automobiles rose, since steel is a key input in car manufacturing."

Determinants of Demand

Non-price factors that shift the demand curve, including consumer income, tastes and preferences, prices of related goods (substitutes and complements), expectations, and the number of buyers.

Similar definitions: demand shifters

Example: "An increase in consumer income is one of the          that shifts the demand curve for normal goods to the right."

Determinants of Supply

Non-price factors that shift the supply curve, including input costs, technology, expectations, the number of sellers, government policies (taxes and subsidies), and natural conditions.

Similar definitions: supply shifters

Example: "A decrease in the cost of raw materials is one of the          that shifts the supply curve to the right."

Diminishing Marginal Returns

The principle that as additional units of a variable input are added to a fixed input, the marginal product of the variable input eventually declines.

Similar definitions: law of diminishing returns, law of diminishing marginal product

Example: "Hiring a tenth worker in a small kitchen led to          because the workers began getting in each other's way."

Diminishing Marginal Utility

The principle that as a consumer consumes more units of a good, the additional satisfaction gained from each additional unit decreases.

Example: "The first slice of pizza brought great satisfaction, but by the fifth slice,          had set in and each additional slice was less enjoyable."

Diseconomies of Scale

A situation in which long-run average total costs increase as the firm expands its scale of production, often due to growing complexity and coordination problems.

Similar definitions: decreasing returns to scale

Example: "The multinational company encountered          when its massive bureaucracy slowed decision-making and raised per-unit costs."

Dominant Strategy

In game theory, a strategy that produces the best outcome for a player regardless of the strategies chosen by other players.

Example: "In the prisoner's dilemma, confessing is a          because each prisoner is better off confessing no matter what the other prisoner does."

Economic Profit

Total revenue minus all costs, including both explicit costs and implicit costs such as opportunity costs; a profit above and beyond normal profit.

Example: "Although the restaurant had positive accounting profit, its          was negative because the owner could have earned more working as a corporate chef."

Economies of Scale

A situation in which long-run average total costs decrease as the firm increases its scale of production, often due to specialization, bulk purchasing, and spreading fixed costs over more units.

Similar definitions: increasing returns to scale

Example: "The car manufacturer achieved          by spreading the cost of its assembly line equipment over millions of vehicles."

Elastic Demand

A condition in which the percentage change in quantity demanded is greater than the percentage change in price, resulting in a price elasticity greater than one.

Example: "Luxury goods tend to have          because consumers can easily postpone purchases when prices rise."

Elastic Supply

A condition in which the percentage change in quantity supplied is greater than the percentage change in price, resulting in a price elasticity greater than one.

Example: "Manufactured goods often have          because factories can quickly increase production when prices rise."

Entrepreneurship

The factor of production involving the initiative, risk-taking, and innovation needed to combine land, labor, and capital to create goods and services.

Example: "         is what drives individuals to start new businesses and bring innovative products to market despite the risk of failure."

Equilibrium Price

The price at which the quantity of a good demanded by consumers equals the quantity supplied by producers, clearing the market with no shortage or surplus.

Similar definitions: market-clearing price, market equilibrium price

Example: "The          of gasoline settled at $3.50 per gallon after supply and demand forces balanced in the market."

Excess Capacity

A situation in which a firm produces below its minimum efficient scale, meaning it could lower its average total cost by producing more output.

Example: "Monopolistically competitive firms operate with          in the long run because they produce on the downward-sloping portion of their ATC curve."

Excise Tax

A per-unit tax imposed on the production or sale of a specific good, which raises the cost of production and shifts the supply curve to the left.

Example: "The government placed an          of $1.00 on each pack of cigarettes to discourage smoking and raise revenue."

Excludable Good

A good for which it is possible to prevent people who have not paid from consuming it.

Example: "Cable television is an          because the provider can block access for customers who do not pay their subscription."

Explicit Costs

Direct, out-of-pocket payments a firm makes for factors of production, such as wages, rent, and materials.

Example: "The bakery's          included the money paid for flour, sugar, electricity, and employee wages."

Externality

A cost or benefit that affects a third party who is not directly involved in the production or consumption of a good or service.

Similar definitions: spillover effect

Example: "Pollution from a factory is a negative          because it harms nearby residents who are not involved in the production process."

Factor Markets

Markets in which the factors of production — land, labor, capital, and entrepreneurship — are bought and sold.

Similar definitions: resource markets, input markets

Example: "In         , firms are the buyers and households are the sellers of resources like labor and capital."

Factors of Production

The resources — land, labor, capital, and entrepreneurship — used to produce goods and services in an economy.

Similar definitions: productive resources, economic resources

Example: "A farm uses all four         : land for crops, labor from farmhands, capital in the form of tractors, and the farmer's entrepreneurship."

Fixed Costs

Costs that remain constant regardless of the level of output and must be paid even if production is zero, such as rent or insurance premiums.

Similar definitions: overhead costs

Example: "The restaurant's          included its monthly lease payment of $5,000, which had to be paid whether the restaurant served 10 customers or 1,000."

Free-Rider Problem

A market failure that occurs when individuals benefit from a good or service without paying for it, reducing the incentive for private firms to produce it.

Example: "National defense suffers from the          because everyone benefits from military protection whether or not they pay taxes."

Game Theory

A branch of economics that studies strategic decision-making among interdependent agents, often applied to analyze oligopoly behavior.

Example: "Economists use          to model how competing firms decide whether to lower prices, knowing their rival may respond."

Gini Coefficient

A numerical measure of income inequality ranging from 0 (perfect equality) to 1 (perfect inequality), derived from the Lorenz curve.

Example: "A country with a          of 0.25 has relatively equal income distribution, while one with 0.60 has significant inequality."

Human Capital

The skills, knowledge, training, and experience that workers possess, which increase their productivity and earning potential.

Example: "Investing in education and job training builds         , which increases a worker's value in the labor market."

Implicit Costs

The opportunity costs of using resources that the firm already owns, representing income the firm forgoes by not employing those resources in their next-best alternative use.

Example: "An entrepreneur's          include the salary she could have earned working for another company instead of running her own business."

Income Effect

The change in quantity demanded of a good that results from a change in the consumer's purchasing power due to a price change.

Example: "When the price of gas dropped, drivers experienced an          — they effectively had more money to spend and bought more gas."

Income Elasticity of Demand

A measure of the responsiveness of the quantity demanded of a good to a change in consumer income; positive for normal goods and negative for inferior goods.

Example: "Luxury cars have a high positive          because demand increases significantly when consumer incomes rise."

Indifference Curve

A curve showing all combinations of two goods that give a consumer the same level of satisfaction or utility.

Example: "Any point along the same          represents an equally satisfying combination of pizza and soda for the consumer."

Inelastic Demand

A condition in which the percentage change in quantity demanded is less than the percentage change in price, resulting in a price elasticity less than one.

Example: "Insulin has          because diabetic patients need it regardless of price changes."

Inelastic Supply

A condition in which the percentage change in quantity supplied is less than the percentage change in price, often because production cannot be easily expanded.

Example: "Beachfront property has          because the amount of coastal land is essentially fixed."

Inferior Good

A good for which demand decreases as consumer income rises, because consumers switch to higher-quality alternatives.

Example: "Instant ramen is an          because as people earn more money, they tend to buy less of it and eat at restaurants instead."

Labor

The human effort, both physical and mental, used in the production of goods and services; one of the four factors of production.

Example: "The construction company hired additional          to meet the growing demand for new housing."

Land

All natural resources used in the production of goods and services, including soil, minerals, water, and timber.

Example: "Farmers depend on          as a factor of production, using soil, water, and sunlight to grow crops."

Law of Demand

The principle that, ceteris paribus, an increase in the price of a good leads to a decrease in the quantity demanded, and vice versa.

Example: "The          explains why fewer people bought concert tickets after the price doubled."

Law of Increasing Opportunity Costs

The principle that as production of one good increases, the opportunity cost of producing additional units rises because resources are not perfectly adaptable.

Example: "The          explains why the production possibilities frontier is bowed outward rather than a straight line."

Law of Supply

The principle that, ceteris paribus, an increase in the price of a good leads to an increase in the quantity supplied, and vice versa.

Example: "According to the         , farmers plant more wheat when wheat prices are high."

Least-Cost Rule

The condition for cost minimization in which a firm allocates spending on inputs so that the marginal product per dollar spent is equal across all inputs (MP_L/P_L = MP_K/P_K).

Example: "The firm followed the          by hiring labor and capital until the marginal product per dollar was the same for each resource."

Long Run

A time period in which all inputs and costs are variable, allowing firms to adjust plant size, enter or exit an industry, and change all factors of production.

Example: "In the         , a firm can build a larger factory or exit the industry entirely if it cannot cover its costs."

Long-Run Average Total Cost (LRATC)

The lowest possible average total cost for each level of output when all inputs are variable, represented by the envelope curve of all short-run ATC curves.

Example: "The firm chose a factory size that placed it at the minimum point of the          curve to achieve the lowest per-unit cost."

Lorenz Curve

A graphical representation of income or wealth distribution that plots the cumulative share of income received against the cumulative share of the population.

Example: "The          bowed far below the line of equality, showing that a small percentage of the population earned most of the income."

Loss Minimization

A short-run strategy in which a firm continues to produce at MR = MC even though it is earning an economic loss, because the loss is smaller than the total fixed costs it would incur by shutting down (P > AVC but P < ATC).

Example: "The firm chose          by continuing to operate because its revenue covered variable costs and contributed toward fixed costs."

Lump-Sum Tax

A fixed tax amount that does not vary with output, income, or any other economic variable, and therefore does not change a firm's marginal cost.

Example: "A          on a firm raises its total and average total costs but does not shift the marginal cost curve or change the profit-maximizing quantity."

Marginal Benefit

The additional satisfaction or value a consumer receives from consuming one more unit of a good or service.

Example: "The          of a second cup of coffee was lower than the first because the consumer was already partially satisfied."

Marginal Cost (MC)

The additional cost incurred by producing one more unit of output; calculated as the change in total cost divided by the change in quantity.

Example: "If producing the 101st widget costs $5 more than producing 100 widgets, the          of the 101st widget is $5."

Marginal Factor Cost (MFC)

The additional cost incurred by employing one more unit of a factor of production, such as one additional worker.

Similar definitions: marginal resource cost

Example: "The firm will hire additional workers as long as the marginal revenue product exceeds the         ."

Marginal Product (MP)

The additional output produced when one more unit of a variable input is added, holding all other inputs constant.

Example: "The          of the fifth worker was 20 units, meaning total output rose by 20 units when the fifth worker was hired."

Marginal Rate of Substitution (MRS)

The rate at which a consumer is willing to trade one good for another while maintaining the same level of satisfaction, shown by the slope of the indifference curve.

Example: "A consumer's          of pizza for soda is 3, meaning she would give up 3 sodas for one more pizza without changing her total utility."

Marginal Revenue (MR)

The additional revenue a firm receives from selling one more unit of output; in perfect competition, MR equals the market price.

Example: "The monopolist's          was less than the price because it had to lower the price on all units to sell the additional one."

Marginal Revenue Product (MRP)

The additional revenue generated by employing one more unit of a factor of production; calculated as marginal product multiplied by marginal revenue.

Example: "The firm should hire an additional worker if the worker's          is greater than or equal to the wage rate."

Marginal Social Benefit

The total benefit to society from consuming one additional unit of a good, including both the private marginal benefit to the consumer and any external benefits to third parties.

Example: "The          of education exceeds the private benefit because an educated workforce generates positive externalities for all of society."

Marginal Social Cost

The total cost to society of producing one additional unit of a good, including both the private marginal cost borne by the producer and any external costs imposed on third parties.

Example: "The          of electricity from a coal plant includes the production cost plus the health and environmental damage from pollution."

Marginal Utility

The additional satisfaction or utility a consumer gains from consuming one more unit of a good or service.

Example: "The          of the third slice of cake was much lower than the first, illustrating diminishing marginal utility."

Market Economy

An economic system in which decisions about production and consumption are made by individuals and firms interacting through markets, guided by the price mechanism.

Similar definitions: free market economy, capitalist economy

Example: "In a         , the forces of supply and demand determine what goods are produced and at what prices."

Market Failure

A situation in which the free market fails to allocate resources efficiently, resulting in a net loss of economic welfare; caused by externalities, public goods, market power, or information asymmetry.

Example: "Pollution is an example of          because the market does not account for the environmental damage caused by production."

Market Power

The ability of a firm to influence the market price of a good or service by adjusting its output, typically held by monopolies and oligopolies.

Example: "Because the utility company was the sole provider of electricity, it had significant          and could set prices above competitive levels."

Market Structure

The organizational characteristics of a market, including the number of firms, type of product, ease of entry and exit, and degree of market power.

Example: "The four main types of          are perfect competition, monopolistic competition, oligopoly, and monopoly."

Microeconomics

The branch of economics that focuses on the behavior and decision-making of individual economic agents such as households, firms, and specific markets.

Example: "         examines how a single firm decides what price to charge and how many workers to hire."

Minimum Efficient Scale

The smallest level of output at which a firm can achieve the lowest long-run average total cost, marking the end of economies of scale.

Example: "The factory reached its          at 10,000 units per month, after which further expansion would not lower average costs."

Minimum Wage

A government-imposed price floor on the wage rate, setting the lowest legal hourly pay that employers can offer workers.

Example: "When the          is set above the equilibrium wage, it can create a surplus of labor, or unemployment."

Mixed Economy

An economic system that combines elements of both market and command economies, with private enterprise operating alongside government regulation.

Example: "The United States is a          because the government regulates industries and provides public goods while most production is done by private firms."

Monopolistic Competition

A market structure with many firms selling differentiated products, low barriers to entry and exit, and some degree of market power due to product differentiation.

Example: "The restaurant industry is an example of          because many restaurants compete by offering different cuisines, atmospheres, and service styles."

Monopoly

A market structure in which a single firm is the sole producer of a good or service with no close substitutes, protected by high barriers to entry.

Example: "A local utility company often operates as a          because it is impractical to have multiple competing power grids in the same area."

Monopsony

A market structure in which there is only one buyer of a factor of production, giving that buyer power to set the price below the competitive level.

Example: "A company town where one factory is the only employer acts as a         , paying lower wages than would exist in a competitive labor market."

Nash Equilibrium

A situation in game theory in which each player is choosing the best strategy given the strategies chosen by all other players, and no player can benefit by unilaterally changing their strategy.

Example: "In the prisoner's dilemma, both prisoners confessing is a          because neither can improve their outcome by changing their decision alone."

Natural Monopoly

A monopoly that arises because a single firm can supply an entire market at a lower average total cost than could two or more firms, due to high fixed costs and economies of scale.

Example: "Water distribution is a          because building duplicate pipeline systems would be wasteful and raise costs for consumers."

Negative Externality

A cost imposed on a third party not directly involved in the production or consumption of a good, resulting in the market overproducing relative to the socially optimal quantity.

Example: "Air pollution from a coal plant is a          because it harms the health of nearby residents who are not involved in the electricity market."

Normal Good

A good for which demand increases as consumer income rises, indicating a positive income elasticity of demand.

Example: "Organic food is a          because consumers tend to buy more of it as their incomes increase."