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I’m going to expand your notes into a complete economics study guide using your exact Q: / A: format. I’ll keep the explanations simple, add examples, and cover the missing history of economic thought, mercantilism, the Physiocrats, Adam Smith, Marx, production, costs, demand, supply, elasticity, equilibrium, market failures, and market structures.

One important distinction to master: a change in a product’s own price causes a movement along its curve. A change in another determinant shifts the entire curve. That rule applies throughout demand and supply.

Complete Economics Study Guide

1. Basic Economic Concepts

Q: What is economics? A: The study of how people use limited resources to satisfy unlimited wants.

Q: What is scarcity? A: Resources are limited, but human wants are unlimited.

Q: What are the four factors of production? A: Land, labor, capital, and entrepreneurship.

Q: What is land? A: Natural resources used in production, such as water, soil, and minerals.

Q: What is labor? A: The physical and mental work people do to produce goods and services.

Q: What is capital? A: Human-made tools used to produce goods and services, such as machines, buildings, and equipment.

Q: What is entrepreneurship? A: Organizing resources, starting businesses, and taking business risks.

Q: What is opportunity cost? A: The value of the next-best alternative you give up when making a choice.

Q: What is a trade-off? A: Giving up some of one thing to get more of another.

Q: What is productivity? A: The amount of output produced using a certain amount of resources. Higher productivity means more output from the same resources.

Q: What is specialization? A: Focusing on producing a particular good or performing a particular task.

Q: What is division of labor? A: Dividing production into smaller tasks performed by different workers.

Q: What are the three basic economic questions? A: What to produce, how to produce it, and who receives what is produced.

Q: What is a market economy? A: An economy where buyers and sellers make most production and purchasing decisions.

Q: What is a command economy? A: An economy where the government makes most major economic decisions.

Q: What is a traditional economy? A: An economy where customs and traditions guide economic decisions.

Q: What is a mixed economy? A: An economy that combines private markets with government involvement.

2. History of Economic Thought

Ancient Greece and Scholasticism

Q: Who was Aristotle? A: An ancient Greek philosopher who studied exchange and wealth acquisition. He criticized usury and monopoly.

Q: Who was Xenophon? A: An ancient Greek writer who discussed household management, wealth, and economic organization.

Q: Who was Thomas Aquinas? A: A medieval theologian who studied economic morality, just prices, just wages, and usury.

Q: What was Scholastic economic thought? A: Medieval religious thinking about the morality and fairness of economic activity.

Q: What is a just price? A: A price considered fair according to the moral and social standards of the time.

Q: What is usury? A: Historically, charging interest on loans, which medieval religious thinkers often criticized.

Mercantilism

Q: What was mercantilism? A: An economic philosophy popular in Europe from roughly the 1500s to the 1700s that emphasized national wealth, precious metals, exports, and government control of trade.

Q: How did mercantilists measure national wealth? A: They emphasized how much gold and silver a country possessed.

Q: What did mercantilists want countries to do with exports and imports? A: Increase exports and restrict imports to create a trade surplus.

Q: What is a trade surplus? A: When a country exports more than it imports.

Q: What is bullionism? A: The belief that accumulating gold and silver is a major measure of national wealth.

Q: What is protectionism? A: Protecting domestic businesses from foreign competition through policies such as tariffs and quotas.

Q: What is a tariff? A: A tax on imported goods.

Q: What is an import quota? A: A limit on the amount of a product that can be imported.

Q: What is colonial mercantilism? A: A system in which a mother country used colonies for raw materials and markets for its finished products.

Q: What is a favorable balance of trade? A: Exports exceed imports, creating a trade surplus.

Q: What role did governments play under mercantilism? A: Governments encouraged exports, restricted imports, supported domestic industries, and sometimes granted monopolies.

Q: What is a government-granted monopoly? A: When the government gives a business exclusive rights to sell a particular good or service.

Q: What is rent-seeking? A: Trying to gain special benefits through political influence or government rules rather than by creating additional economic value.

Q: What is the main criticism of mercantilism? A: It can encourage trade restrictions, protect inefficient businesses, and treat trade as if one country's gain must be another country's loss.

The Physiocrats

Q: Who were the Physiocrats? A: An 18th-century French school of economic thought that believed land and agriculture were the primary sources of national wealth.

Q: Who was François Quesnay? A: A leading Physiocrat who studied how income and production flowed through the economy.

Q: What did Physiocrats believe created wealth? A: Agriculture and the productive use of land.

Q: What did Physiocrats believe about manufacturing and trade? A: They generally considered agriculture the main source of new net wealth, while manufacturing and trade primarily transformed or circulated existing wealth.

Q: What does laissez-faire mean? A: “Let things take their own course.” It supports allowing economic activity to operate with limited government interference.

Q: What was the Tableau Économique? A: Quesnay's model showing how income and economic output circulated between different groups in society.

Q: How were Physiocrats different from mercantilists? A: Mercantilists emphasized gold, silver, and trade surpluses. Physiocrats emphasized agriculture, land, and freer economic activity.

Classical Economics

Q: Who was Adam Smith? A: A Scottish economist often called the father of modern economics.

Q: What famous book did Adam Smith publish in 1776? A: The Wealth of Nations.

Q: How did Adam Smith define national wealth? A: Through a nation's productive capacity and output, rather than simply its gold and silver reserves.

Q: What is the invisible hand? A: The idea that people pursuing their own interests in competitive markets can unintentionally benefit others through economic exchange.

Q: What is self-interest in economics? A: Making choices to improve your own situation, such as a business trying to earn profit.

Q: What is laissez-faire economics? A: An approach favoring limited government interference in markets.

Q: Who was Jean-Baptiste Say? A: A classical economist associated with Say's Law.

Q: What is Say's Law? A: The principle commonly summarized as “supply creates its own demand.” Production generates income that can be used to purchase goods and services.

Q: Who was David Ricardo? A: A classical economist known for his work on international trade and comparative advantage.

Q: What is comparative advantage? A: The ability to produce something at a lower opportunity cost than another producer.

Q: Who was Thomas Malthus? A: An economist who argued that population could grow faster than the food supply.

Q: Who was John Stuart Mill? A: A classical economist and philosopher who wrote about production, distribution, liberty, and social reform.

Marx and Later Economic Thought

Q: Who was Karl Marx? A: A thinker who criticized capitalism and studied class conflict, ownership, and the relationship between workers and business owners.

Q: Who is the bourgeoisie in Marx's theory? A: The capitalist class that owns businesses and productive resources.

Q: Who is the proletariat in Marx's theory? A: The working class, who sell their labor for wages.

Q: What is surplus value? A: In Marx's theory, the value workers create beyond the value represented by their wages, which owners appropriate as profit.

Q: What is the reserve army of labor? A: Marx's term for unemployed or underemployed workers available to employers.

Q: What is the labor theory of value? A: A theory connecting a product's value to the labor required to produce it.

Q: What was the Marginal Revolution? A: A late-19th-century shift toward explaining economic value and decisions using marginal utility and marginal analysis.

Q: Who were three major figures in the Marginal Revolution? A: Carl Menger, William Stanley Jevons, and Léon Walras.

Q: Who was Carl Menger? A: An Austrian economist who helped develop the theory of marginal utility.

Q: What is neoclassical economics? A: An approach emphasizing supply and demand, individual choices, incentives, and marginal analysis.

Q: Who was John Maynard Keynes? A: An economist who argued that insufficient total spending can cause prolonged recessions and unemployment.

Q: What is Keynesian economics? A: An approach emphasizing aggregate demand and the role of government policy in stabilizing the economy.

Q: What is the historical order of the major schools? A: Ancient Greek thinkers → Scholasticism → Mercantilism → Physiocrats → Classical economics → Marx → Marginal Revolution and neoclassical economics → Keynesian economics.

3. Scarcity, Opportunity Cost, and the PPC

Q: What is a Production Possibilities Curve (PPC)? A: A graph showing the maximum combinations of two goods an economy can produce with its current resources and technology.

Q: What does a point on the PPC represent? A: Productive efficiency, meaning resources are being used to produce a combination on the frontier.

Q: What does a point inside the PPC represent? A: Inefficient production or underused resources, such as unemployment.

Q: What does a point outside the PPC represent? A: An output combination that is currently unattainable with existing resources and technology.

Q: Why is the PPC usually bowed outward? A: Because of the law of increasing opportunity cost.

Q: What is the law of increasing opportunity cost? A: Producing more of one good requires giving up increasingly larger amounts of another good.

Q: What causes movement along the PPC? A: Shifting existing resources from producing one good to producing another.

Q: What causes the PPC to shift outward? A: Better technology, more resources, improved worker skills, or increased productivity.

Q: What causes the PPC to shift inward? A: A loss of resources or productive capacity, such as a major disaster or war.

Q: Why do capital goods help future economic growth? A: They increase the economy's future productive capacity.

Q: What is productive efficiency? A: Producing goods with the least possible waste or cost.

Q: What is allocative efficiency? A: Producing the combination of goods and services that best matches society's preferences.

4. Utility, Production, and Costs

Utility

Q: What is utility? A: The satisfaction a consumer receives from a product.

Q: What is total utility? A: The total satisfaction from all units consumed.

Q: What is marginal utility? A: The additional satisfaction from consuming one more unit.

Q: What is the law of diminishing marginal utility? A: Each additional unit of a good usually provides less extra satisfaction than the previous unit.

Q: Does diminishing marginal utility mean total utility always decreases? A: No. Total utility can continue rising, but by smaller amounts. It decreases only when marginal utility becomes negative.

Production

Q: What is a production function? A: A relationship showing how inputs are turned into output.

Q: What is the short run? A: A period when at least one production input is fixed.

Q: What is the long run? A: A period long enough for all production inputs to be variable.

Q: What is total product? A: The total amount of output produced.

Q: What is marginal product? A: The additional output created by adding one more unit of a variable input.

Q: How do you calculate marginal product? A: Change in total output divided by change in the quantity of the input.

Q: What is average product? A: Total output divided by the quantity of an input, such as output per worker.

Q: What is the law of diminishing marginal returns? A: Adding more of a variable input to fixed inputs eventually causes marginal product to decrease.

Q: What happens in Stage 1 of production? A: Production becomes more efficient as inputs are added. Marginal product generally rises initially, and the stage ends around the maximum average product.

Q: What happens in Stage 2 of production? A: Marginal product is positive but declining. Total output continues rising at a decreasing rate.

Q: What happens in Stage 3 of production? A: Marginal product becomes negative, so adding more variable input reduces total output.

Costs

Q: What are fixed costs? A: Costs that do not change with output in the short run, such as rent.

Q: What are variable costs? A: Costs that change with output, such as raw materials.

Q: What is total cost? A: Total fixed cost plus total variable cost.

Q: What is average fixed cost (AFC)? A: Total fixed cost divided by quantity produced.

Q: What happens to average fixed cost as output increases? A: It decreases because fixed costs are spread across more units.

Q: What is average variable cost (AVC)? A: Total variable cost divided by quantity produced.

Q: What is average total cost (ATC)? A: Total cost divided by quantity produced. ATC = AFC + AVC.

Q: What is marginal cost (MC)? A: The additional cost of producing one more unit.

Q: How do you calculate marginal cost? A: Change in total cost divided by change in quantity produced.

Q: What happens to ATC when MC is below ATC? A: ATC decreases.

Q: What happens to ATC when MC is above ATC? A: ATC increases.

Q: What is an explicit cost? A: A direct monetary payment, such as wages or rent.

Q: What is an implicit cost? A: The opportunity cost of using resources you already own, such as the salary you give up to run your business.

Q: What is accounting profit? A: Total revenue minus explicit costs.

Q: What is economic profit? A: Total revenue minus both explicit and implicit costs.

5. Demand and Consumer Choices

Q: What is demand? A: The quantities consumers are willing and able to buy at different prices during a given period.

Q: What are the three requirements for demand? A: Desire, willingness, and ability to buy.

Q: What is desire? A: You want the product.

Q: What is willingness? A: You are prepared to pay for the product.

Q: What is ability? A: You have enough money or resources to buy the product.

Q: What is the law of demand? A: As price rises, quantity demanded falls. As price falls, quantity demanded rises, other things equal.

Q: What is the income effect? A: A price change changes purchasing power. Lower prices allow consumers to buy more with their money.

Q: What is the substitution effect? A: Consumers switch toward relatively cheaper alternatives. Example: if Coke becomes more expensive, some consumers buy Pepsi.

Q: What is diminishing marginal utility? A: Each additional unit usually gives less extra satisfaction. Example: each additional slice of pizza may be less satisfying than the previous slice.

Q: What are consumer preferences? A: What consumers like or want. Example: a sneaker trend can increase demand for a particular brand.

Q: How do prices of related products affect demand? A: A higher price for a substitute increases demand for the other good. A higher price for a complement decreases demand for the related good.

Q: What are substitutes? A: Goods that can replace each other, such as Coke and Pepsi.

Q: What are complements? A: Goods used together, such as printers and ink.

Q: How does the number of consumers affect demand? A: More consumers increase market demand; fewer consumers decrease it.

Q: How do future price expectations affect demand? A: If consumers expect a price to rise later, current demand may increase because they buy sooner.

Q: How does income affect demand for normal goods? A: Higher income increases demand; lower income decreases demand.

Q: How does income affect demand for inferior goods? A: Higher income decreases demand; lower income increases demand.

Q: What is a normal good? A: A good whose demand increases when income rises.

Q: What is an inferior good? A: A good whose demand decreases when income rises. This describes its relationship with income, not its quality.

Q: What is market demand? A: The total quantity demanded by all consumers at each price.

Q: How is market demand calculated? A: Add together the quantities demanded by all individual consumers at each price.

6. Changes in Demand

Q: What is a change in quantity demanded? A: A movement along the demand curve caused only by a change in the product's own price.

Q: What causes a shift in demand? A: A change in a non-price determinant, such as income, preferences, or the number of consumers.

Q: What does a rightward shift in demand mean? A: Demand increases. Consumers want to buy more at every price.

Q: What does a leftward shift in demand mean? A: Demand decreases. Consumers want to buy less at every price.

Q: What are the five major non-price determinants of demand? A: Consumer preferences, number of buyers, consumer income, prices of related goods, and expectations.

Q: What is the key question for demand problems? A: Did the product's own price change? Yes = movement along demand. No = look for a shift.

Q: What happens to demand when a normal good becomes more popular? A: Demand shifts right.

Q: What happens to demand for Pepsi if Coke's price rises? A: Demand for Pepsi may shift right because Coke and Pepsi are substitutes.

Q: What happens to demand for printer ink if printer prices rise? A: Demand for ink may shift left because printers and ink are complements.

Q: What happens to demand for a normal good if consumer income falls? A: Demand shifts left.

Q: What happens to demand if more buyers enter a market? A: Market demand shifts right.

7. Supply and Producer Choices

Q: What is supply? A: The quantities producers are willing and able to sell at different prices.

Q: What are the two requirements for supply? A: Willingness and ability to produce and sell a product.

Q: What is the law of supply? A: As price rises, quantity supplied rises. As price falls, quantity supplied falls, other things equal.

Q: Why does the supply curve usually slope upward? A: Higher prices generally give producers an incentive to produce and sell more.

Q: What are the eight supply determinants? A: Input costs, productivity, weather, regulations, taxes and subsidies, number of suppliers, expectations, and technology.

Q: How do input costs affect supply? A: Higher input costs decrease supply. Example: more expensive flour makes bread production more expensive.

Q: How does productivity affect supply? A: Higher productivity increases supply because producers can make more output with the same resources.

Q: How does weather affect supply? A: Good weather can increase agricultural supply. Bad weather can decrease it.

Q: How do government regulations affect supply? A: Regulations that raise production costs tend to decrease supply. Removing costly requirements can increase supply.

Q: How do taxes affect supply? A: Taxes on producers generally increase production costs and decrease supply.

Q: How do subsidies affect supply? A: Subsidies reduce producers' effective costs and generally increase supply.

Q: How does the number of suppliers affect supply? A: More suppliers increase market supply. Fewer suppliers decrease market supply.

Q: How do future price expectations affect supply? A: If producers expect higher prices later, they may reduce current supply by holding goods back, when storage or delayed sales are possible.

Q: How does technology affect supply? A: Better technology usually lowers production costs or increases productivity, shifting supply right.

Q: How do the prices of related products in production affect supply? A: Producers may shift resources toward whichever product becomes more profitable and away from the other product.

Q: What is a change in quantity supplied? A: A movement along the supply curve caused only by a change in the product's own price.

Q: What is a change in supply? A: A shift of the entire supply curve caused by a non-price determinant.

Q: What shifts supply right? A: Lower input costs, better technology, higher productivity, favorable weather, subsidies, fewer costly regulations, or more suppliers.

Q: What shifts supply left? A: Higher input costs, worse technology, lower productivity, unfavorable weather, taxes, more costly regulations, or fewer suppliers.

Q: What is the key question for supply problems? A: Did the product's own price change? Yes = movement along supply. No = look for a shift.

8. Price Elasticity of Demand and Supply

Q: What is elasticity? A: A measure of how strongly one variable responds to a change in another variable.

Q: What is price elasticity of demand? A: How strongly quantity demanded responds to a change in price.

Q: What is the formula for price elasticity of demand? A: Percentage change in quantity demanded divided by percentage change in price. Many classes use the absolute value when classifying demand.

Q: What is elastic demand? A: Quantity demanded changes proportionally more than price. Elasticity is greater than 1 in absolute value.

Q: What is inelastic demand? A: Quantity demanded changes proportionally less than price. Elasticity is less than 1 in absolute value.

Q: What is unit elastic demand? A: Quantity demanded changes by the same percentage as price. Elasticity equals 1 in absolute value.

Q: What is perfectly inelastic demand? A: Quantity demanded does not change when price changes. Elasticity equals 0.

Q: What is perfectly elastic demand? A: Buyers will buy at one price but not at a higher price in the ideal model. Elasticity is infinite.

Q: What makes demand more elastic? A: Many substitutes, more time to adjust, a large share of income spent on the good, and a less necessary product.

Q: What makes demand more inelastic? A: Few substitutes, necessity, a small share of income spent, and little time to adjust.

Q: What is an example of elastic demand? A: A restaurant meal with many alternatives. If its price rises, customers can eat somewhere else.

Q: What is an example of inelastic demand? A: A necessary medicine with few substitutes, although actual elasticity depends on the medicine and available alternatives.

Q: What is total revenue? A: Price multiplied by quantity sold. Total revenue = P × Q.

Q: What happens to total revenue when price increases with elastic demand? A: Revenue decreases because quantity demanded falls by a larger percentage.

Q: What happens to total revenue when price decreases with elastic demand? A: Revenue increases because quantity demanded rises by a larger percentage.

Q: What happens to total revenue when price increases with inelastic demand? A: Revenue increases because quantity demanded falls by a smaller percentage.

Q: What happens to total revenue when price decreases with inelastic demand? A: Revenue decreases because quantity demanded rises by a smaller percentage.

Q: What happens to total revenue with unit elastic demand? A: Total revenue stays the same in the standard total-revenue test.

Q: What is the total-revenue test? A: Elastic = price and revenue move in opposite directions. Inelastic = price and revenue move in the same direction. Unit elastic = revenue stays the same.

Q: What is price elasticity of supply? A: How strongly quantity supplied responds to a change in price.

Q: What determines supply elasticity? A: How quickly producers can change output, their available capacity, access to inputs, and the time available to adjust.

Q: Why is supply often more elastic in the long run? A: Producers have more time to expand capacity, hire workers, and change production methods.

9. Market Equilibrium and Price Controls

Q: What is market equilibrium? A: The price at which quantity supplied equals quantity demanded.

Q: What is equilibrium price? A: The price where quantity supplied equals quantity demanded.

Q: What is equilibrium quantity? A: The amount bought and sold at equilibrium.

Q: What is a surplus? A: When quantity supplied is greater than quantity demanded.

Q: What usually causes a surplus? A: A price above equilibrium.

Q: What happens to price when there is a surplus? A: Competitive pressure usually pushes price down toward equilibrium.

Q: What is a shortage? A: When quantity demanded is greater than quantity supplied.

Q: What usually causes a shortage? A: A price below equilibrium.

Q: What happens to price when there is a shortage? A: Competitive pressure usually pushes price up toward equilibrium.

Q: What happens when demand increases and supply stays the same? A: Equilibrium price rises and equilibrium quantity rises.

Q: What happens when demand decreases and supply stays the same? A: Equilibrium price falls and equilibrium quantity falls.

Q: What happens when supply increases and demand stays the same? A: Equilibrium price falls and equilibrium quantity rises.

Q: What happens when supply decreases and demand stays the same? A: Equilibrium price rises and equilibrium quantity falls.

Q: What happens when demand and supply both shift? A: The outcome depends on the direction and relative size of both shifts.

Q: What is the price system? A: A system in which prices communicate information and incentives to buyers and sellers.

Q: What are the advantages of using prices to allocate resources? A: Prices are familiar, flexible, and can respond to changing market conditions without a central authority assigning every unit.

Q: What are problems with coupon rationing? A: Administrative costs, perceived unfairness, distorted incentives, counterfeiting, and possible black markets.

Q: What is a price ceiling? A: A legal maximum price.

Q: When is a price ceiling binding? A: When it is below equilibrium.

Q: What does a binding price ceiling usually cause? A: A shortage.

Q: What is rent control? A: A legal limit on the rent landlords can charge. If binding below equilibrium, it can create a shortage of rental housing.

Q: What is a price floor? A: A legal minimum price.

Q: When is a price floor binding? A: When it is above equilibrium.

Q: What does a binding price floor usually cause? A: A surplus.

Q: How does a minimum wage act as a price floor? A: If it is above the equilibrium wage in the basic competitive model, the quantity of labor supplied can exceed the quantity of labor demanded, creating a surplus of labor.

Q: What is a nonbinding price control? A: A price ceiling above equilibrium or a price floor below equilibrium. It does not change the equilibrium outcome in the basic model.

10. Market Failure and Externalities

Q: What is market failure? A: When a market fails to allocate resources efficiently, leading to too much or too little production.

Q: What are the five common causes of market failure? A: Inadequate competition, externalities, public goods, inadequate information, and resource immobility.

Q: What is inadequate competition? A: When limited competition gives firms market power and can lead to higher prices or lower output.

Q: What is inadequate information? A: When buyers or sellers lack important information needed to make good economic decisions.

Q: What is resource immobility? A: When labor, capital, land, or entrepreneurs cannot easily move to where they are most productive.

Q: What is an externality? A: A cost or benefit affecting a third party who is not directly involved in a transaction.

Q: What is a negative externality? A: An uncompensated cost imposed on others. Example: pollution affecting nearby residents.

Q: Why do negative externalities cause overproduction? A: Producers may not pay the full social cost of production, so the market produces more than the socially efficient amount.

Q: How can government address negative externalities? A: Taxes or regulations can make producers account for some of the external costs, reducing production.

Q: What is a positive externality? A: An uncompensated benefit received by third parties. Examples include education and vaccination.

Q: Why can positive externalities cause underproduction? A: People making private decisions do not receive all the benefits their actions create for society.

Q: How can government address positive externalities? A: Subsidies or public provision can encourage more of the beneficial activity.

Q: What is a private cost? A: A cost paid by a buyer or seller directly involved in a transaction.

Q: What is a social cost? A: The total cost to society, including private costs and external costs.

Q: What is a private benefit? A: A benefit received by someone directly involved in a transaction.

Q: What is a social benefit? A: The total benefit to society, including benefits received by third parties.

Q: What is a public good? A: A good that is nonexcludable and nonrival, such as national defense.

Q: What does nonexcludable mean? A: It is difficult to prevent people who have not paid from benefiting from the good.

Q: What does nonrival mean? A: One person's use does not substantially reduce the amount available for others.

Q: Why might private markets underproduce public goods? A: Businesses may struggle to collect payment from everyone who benefits.

Q: What is the free-rider problem? A: People benefit from a good without paying for it, making it difficult for private providers to recover their costs.

Q: Why might education receive government support? A: Education creates benefits for society beyond the individual student, such as a more skilled workforce.

Q: Why might vaccinations receive government support? A: Vaccinations can protect the vaccinated person and reduce the spread of disease to others.

11. Market Structures and Business Organizations

Market Structures

Q: What are the four main market structures? A: Perfect competition, monopolistic competition, oligopoly, and monopoly.

Q: What is perfect competition? A: A market with many buyers and sellers, identical products, and relatively easy entry and exit.

Q: What is a price taker? A: A firm that cannot influence the market price and must accept it.

Q: What does the demand curve look like for a perfectly competitive firm? A: A horizontal line at the market price in the standard model.

Q: What is monopolistic competition? A: A market with many firms selling differentiated products and relatively easy entry and exit.

Q: What is product differentiation? A: Making a product different through branding, features, quality, location, or service.

Q: What is nonprice competition? A: Competing through advertising, quality, design, service, or branding instead of only price.

Q: What is an oligopoly? A: A market dominated by a few large firms.

Q: What is interdependence in an oligopoly? A: Each firm's decisions affect its competitors, so firms must consider how rivals may respond.

Q: What is collusion? A: Competitors cooperating to reduce competition, such as by coordinating prices or output.

Q: What is price-fixing? A: An agreement between competing businesses to set prices rather than compete independently. It is generally illegal.

Q: What is a monopoly? A: A market with one seller and no close substitutes, protected by barriers to entry.

Q: What are barriers to entry? A: Obstacles that make it difficult for new firms to enter a market, such as high startup costs, patents, or legal restrictions.

Q: What is a natural monopoly? A: A market where one firm can supply the entire market at a lower average cost than multiple competing firms, often because of high infrastructure costs.

Q: What is a patent? A: A legal right granting an inventor temporary exclusive rights to an invention under applicable law.

Q: What is the profit-maximizing rule? A: A firm generally chooses the output where marginal revenue equals marginal cost (MR = MC), subject to whether production is worthwhile.

Q: What is marginal revenue (MR)? A: The additional revenue from selling one more unit.

Q: What is marginal cost (MC)? A: The additional cost of producing one more unit.

Q: What is the relationship between price and marginal revenue in perfect competition? A: Price equals marginal revenue for an individual firm.

Business Organizations

Q: What is a sole proprietorship? A: A business owned by one person.

Q: What is an advantage of a sole proprietorship? A: It is relatively easy to start, and the owner maintains control.

Q: What is a disadvantage of a sole proprietorship? A: Unlimited liability, meaning the owner can be personally responsible for business debts.

Q: What is a partnership? A: A business owned by two or more people who share responsibilities and profits according to their agreement.

Q: What is a corporation? A: A business that exists as a separate legal entity and is owned by shareholders.

Q: What is limited liability? A: Shareholders generally risk their investment rather than being personally responsible for all corporate debts.

Q: What is a disadvantage of a traditional corporation? A: Potential double taxation, where corporate profits are taxed and shareholder dividends may be taxed again.

Q: What is a merger? A: When two or more businesses combine.

Q: What is a horizontal merger? A: Two businesses at the same stage of production that sell similar products combine. Example: two banks merging.

Q: What is a vertical merger? A: Businesses at different stages of the same supply chain combine. Example: a manufacturer merges with a supplier.

Q: What is a conglomerate merger? A: Businesses from unrelated industries combine.

12. Final Memory Sheet

Memorize these rules because they connect many of the questions on your exam.

History of economics

Mercantilism = gold, silver, exports, trade restrictions.

Physiocrats = agriculture, land, laissez-faire.

Adam Smith = invisible hand, self-interest, The Wealth of Nations (1776).

Jean-Baptiste Say = “supply creates its own demand.”

Karl Marx = bourgeoisie, proletariat, surplus value, reserve army of labor.

Marginal Revolution = marginal utility and marginal analysis.

Keynes = aggregate demand and recessions.

Demand and supply

Demand right: demand increases.

Demand left: demand decreases.

Supply right: supply increases.

Supply left: supply decreases.

Own price changes: movement along the curve.

Non-price determinant changes: shift of the curve.

Equilibrium and efficiency

Demand increases: price rises, quantity rises, if supply stays constant.

Supply increases: price falls, quantity rises, if demand stays constant.

Binding price ceiling: shortage.

Binding price floor: surplus.

Negative externality: social costs, often overproduction.

Positive externality: social benefits, often underproduction.

Profit maximization: MR = MC.

The eight supply determinants — quick review

One final warning: don't memorize only the letters or definitions. For each concept, make sure you can identify a real example and explain whether it causes a movement along a curve or shifts the entire curve. That is where many economics test mistakes happen.