Review AP Macro Unit 1 to build the foundation every other unit depends on. Scarcity, the PPC, comparative advantage, and supply and demand are the core models you will use again in the loanable funds market, the foreign exchange market, and aggregate demand and supply.
Use the topic guides, key terms, and practice questions available here to work through all six topics before moving to Unit 2.
Unit 1 covers the six foundational topics of AP Macroeconomics, from the definition of scarcity through the mechanics of market equilibrium. These concepts are not just introductory vocabulary; they are the analytical tools you will apply in every unit that follows.
Because land, labor, and capital are limited, every production decision involves a trade-off. The production possibilities curve (PPC) maps those trade-offs graphically, showing efficient points on the curve, inefficient points inside it, and unattainable points outside it.
Comparative advantage is determined by lower opportunity cost, not by who produces more. When producers specialize according to comparative advantage and trade at terms between their respective opportunity costs, both parties can consume beyond their own PPC.
The law of demand and the law of supply describe how price and quantity move together. Shifts in demand or supply caused by non-price determinants move the equilibrium price and quantity, and market forces eliminate surpluses and shortages automatically.
The supply and demand model introduced in Topics 1.4 through 1.6 reappears in nearly every later unit: the money market, the loanable funds market, and the foreign exchange market all use the same curve-shift logic. Getting the mechanics right here, including distinguishing a movement along a curve from a shift of the curve, pays off throughout the course.
Defines scarcity as the root cause of economic trade-offs and introduces the four factors of production: land, labor, capital, and entrepreneurship. Distinguishes rivalrous scarce resources from non-rival resources like established knowledge.
Introduces the PPC model to illustrate trade-offs, opportunity cost, efficiency, inefficiency, and economic growth or contraction. Covers bowed-out versus straight-line PPC shapes and what causes the curve to shift.
Distinguishes absolute advantage from comparative advantage using opportunity cost calculations. Explains how specialization according to comparative advantage and trade within the terms-of-trade range allows both parties to consume beyond their PPC.
Covers the law of demand, the downward-sloping demand curve, and the difference between a movement along the curve and a shift of the curve. Uses the INSECT acronym to organize the six non-price determinants of demand.
Covers the law of supply, the upward-sloping supply curve, and the difference between a movement along the curve and a shift of the curve. Uses the R-O-T-T-E-N acronym to organize the six non-price determinants of supply.
Defines equilibrium as the price where quantity demanded equals quantity supplied. Explains how surpluses and shortages resolve through price adjustment, and how shifts in demand or supply produce a new equilibrium price and quantity.
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Review Supply with attention to how the concept appears in AP-style source and evidence questions.
Review Market Equilibrium, Disequilibrium, and Changes in Equilibrium with attention to how the concept appears in AP-style source and evidence questions.
Review Comparative Advantage and Gains from Trade with attention to how the concept appears in AP-style source and evidence questions.
Review Opportunity Cost and the Production Possibilities Curve (PPC) with attention to how the concept appears in AP-style source and evidence questions.
Scarcity exists because society's wants and needs are unlimited while the resources available to meet them are finite. This forces every individual, firm, and government to make choices and accept trade-offs. The four factors of production are land (natural resources), labor (human effort), capital (physical tools and machinery), and entrepreneurship. Most factors are rivalrous and scarce, but established knowledge can be non-rival because one person using it does not prevent another from using it.
| Factor | Example | Typically scarce? |
|---|---|---|
| Land | Farmland, oil deposits | Yes |
| Labor | Workers, hours worked | Yes |
| Capital | Machinery, buildings | Yes |
| Established knowledge | Mathematical theorems, open-source code | Not necessarily (non-rival) |
The production possibilities curve (PPC) shows the maximum combinations of two goods an economy can produce when all resources are fully and efficiently used. Points on the curve are productively efficient; points inside are inefficient (underutilized resources); points outside are unattainable with current resources and technology. The slope of the PPC at any point equals the opportunity cost of producing one more unit of the good on the horizontal axis. A bowed-out (concave) PPC reflects increasing opportunity costs because resources are not equally suited to all uses. A straight-line PPC reflects constant opportunity costs. The PPC shifts outward with economic growth (more resources or better technology) and inward with economic contraction.
| PPC Shape | Opportunity Cost Pattern | Cause |
|---|---|---|
| Bowed out (concave) | Increasing | Resources are not equally productive in all uses |
| Straight line | Constant | Resources are perfectly interchangeable between uses |
| Bowed in (convex) | Decreasing | Resources become more productive as production specializes |
Absolute advantage means producing more output with the same resources. Comparative advantage means producing at a lower opportunity cost. A producer should specialize in the good for which they have the lower opportunity cost, even if the other producer has absolute advantage in everything. When two parties specialize according to comparative advantage and trade at terms of trade that fall between their individual opportunity costs, both can consume combinations beyond their own PPC. To find comparative advantage from a table, calculate each producer's opportunity cost for each good and compare.
| Concept | Definition | How to identify it |
|---|---|---|
| Absolute advantage | Produces more output per resource unit | Compare total output or input required directly |
| Comparative advantage | Produces at lower opportunity cost | Calculate and compare opportunity costs for each producer |
The law of demand states that price and quantity demanded move in opposite directions, all else equal (ceteris paribus), producing a downward-sloping demand curve. A change in price causes a movement along the demand curve (change in quantity demanded). A change in a non-price determinant shifts the entire curve left or right (change in demand). The INSECT acronym covers the main demand shifters: Income, Number of consumers, Substitutes, Expectations of future price, Complementary goods, and Tastes and preferences. Normal goods see demand rise with income; inferior goods see demand fall with income.
| Event | Effect on demand curve | Direction of shift |
|---|---|---|
| Income rises (normal good) | Demand increases | Rightward |
| Income rises (inferior good) | Demand decreases | Leftward |
| Price of substitute rises | Demand increases | Rightward |
| Price of complement rises | Demand decreases | Leftward |
| Consumers expect higher future prices | Demand increases now | Rightward |
The law of supply states that price and quantity supplied move in the same direction, ceteris paribus, producing an upward-sloping supply curve. A price change causes a movement along the supply curve (change in quantity supplied). A change in a non-price determinant shifts the entire supply curve. The R-O-T-T-E-N acronym covers the main supply shifters: Resource (input) prices, Other goods' prices, Technology, Taxes and subsidies, Expectations of future prices, and Number of sellers. Lower input prices and better technology shift supply rightward (increase supply); higher input prices and new taxes shift it leftward (decrease supply).
| Event | Effect on supply curve | Direction of shift |
|---|---|---|
| Input prices fall | Supply increases | Rightward |
| New tax on producers | Supply decreases | Leftward |
| Technology improves | Supply increases | Rightward |
| Number of sellers increases | Supply increases | Rightward |
| Producers expect higher future prices | Supply decreases now | Leftward |
Equilibrium is the price at which quantity demanded equals quantity supplied, shown where the demand and supply curves intersect. When price is above equilibrium, a surplus (excess supply) exists and price falls. When price is below equilibrium, a shortage (excess demand) exists and price rises. Market forces automatically push price back toward equilibrium. When a demand or supply curve shifts, comparative statics analysis identifies the new equilibrium: compare the original and new intersection points to determine whether price and quantity rise, fall, or produce an ambiguous result when both curves shift simultaneously.
| Shift scenario | Effect on equilibrium price | Effect on equilibrium quantity |
|---|---|---|
| Demand increases only | Rises | Rises |
| Demand decreases only | Falls | Falls |
| Supply increases only | Falls | Rises |
| Supply decreases only | Rises | Falls |
| Demand increases + Supply decreases | Rises | Ambiguous |
Try AP-style multiple-choice questions and written prompts after you review the notes.
| Term | Definition |
|---|---|
| Factors of production | The four inputs used to produce goods and services: land (natural resources), labor (human effort), capital (physical tools and machinery), and entrepreneurship. Most are scarce and rivalrous. |
| Increasing Opportunity Cost | As production of one good rises, each additional unit requires giving up progressively more of the other good. This produces the bowed-out shape of the PPC. |
| Absolute Advantage | The ability to produce more of a good than another producer using the same quantity of resources. Does not determine who should specialize. |
| specialization | Concentrating production on the good for which a producer has comparative advantage (lower opportunity cost), enabling gains from trade. |
| Terms of Trade | The exchange rate between two goods in trade. Mutually beneficial trade requires terms that fall between each producer's individual opportunity costs. |
| INSECT acronym | Income, Number of consumers, Substitutes, Expectations of future price, Complementary goods, Tastes: the six non-price determinants that shift the demand curve. |
| Demand Curve | A downward-sloping graph showing the inverse relationship between price and quantity demanded, ceteris paribus. |
| Quantity Demanded | The amount of a good consumers are willing and able to buy at a specific price. Changes in price cause movements along the demand curve, not shifts. |
| R-O-T-T-E-N | Resource prices, Other goods' prices, Technology, Taxes and subsidies, Expectations of future prices, Number of sellers: the six non-price determinants that shift the supply curve. |
| Supply Curve | An upward-sloping graph showing the positive relationship between price and quantity supplied, ceteris paribus. |
| input prices | The costs of labor, raw materials, and capital used in production. Higher input prices shift the supply curve leftward; lower input prices shift it rightward. |
| Equilibrium Price | The price at which quantity demanded equals quantity supplied. At this price, the market clears with no surplus or shortage. |
| surplus | A market condition in which quantity supplied exceeds quantity demanded at a price above equilibrium. Market forces push price downward to restore equilibrium. |
A price change never shifts the demand or supply curve; it only changes quantity demanded or quantity supplied along the existing curve. Only a non-price determinant (like income, input prices, or technology) shifts the entire curve. Mixing these up is the most common graphing error in Unit 1.
Specialization is always based on lower opportunity cost (comparative advantage), not on who produces more (absolute advantage). One producer can have absolute advantage in both goods but cannot have comparative advantage in both.
Only points on the PPC are productively efficient. Points inside the curve indicate underutilized or misallocated resources, not a different kind of efficiency. Points outside the curve are unattainable with current resources and technology.
When both demand and supply shift at the same time, one of the two outcomes (price or quantity) is often ambiguous without knowing the relative size of the shifts. State the ambiguity explicitly rather than guessing a direction.
A surplus occurs when price is above equilibrium (quantity supplied exceeds quantity demanded) and price falls. A shortage occurs when price is below equilibrium (quantity demanded exceeds quantity supplied) and price rises. Keeping the direction of price adjustment tied to the type of imbalance prevents this error.
AP Macro free-response questions frequently ask you to draw and label a correctly shaped graph, identify a specific point, or show the effect of a shift. For Unit 1, that means drawing a bowed-out PPC with labeled axes and points, or drawing supply and demand curves with a labeled equilibrium. Axes must be labeled with the correct variable names, and any shift must show the original and new curve with an arrow indicating direction.
The exam tests opportunity cost and comparative advantage calculations directly from data tables or PPC graphs. You may be asked to calculate the opportunity cost of one good in terms of another, identify which producer has comparative advantage, or determine a valid terms-of-trade range. Show your work by writing out the ratio explicitly.
A common task type asks you to identify a non-price determinant, explain which curve it shifts and in which direction, and then state the effect on equilibrium price and quantity. Unit 1 supply and demand logic reappears in the money market, loanable funds market, and foreign exchange market in later units, so the explain-and-predict skill carries through the entire course.
Open the individual guides for Unit 1 when you want a closer review of one topic.
browse guidesPractice free-response reasoning and compare your answer with scoring guidance.
practice FRQsWatch past review streams filtered to Unit 1 when you want a video walkthrough.
open videosUse unit cheatsheets for a quick visual review after you work through the notes.
open cheatsheetsEstimate your broader AP score goal after you review the course and exam format.
open calculatorAP Macro Unit 1 covers 6 topics: Scarcity (1.1), Opportunity Cost and the Production Possibilities Curve (1.2), Comparative Advantage and Gains from Trade (1.3), Demand (1.4), Supply (1.5), and Market Equilibrium, Disequilibrium, and Changes in Equilibrium (1.6). These foundational concepts underpin everything else in the course. See the full topic breakdown at AP Macro Unit 1.
AP Macro Unit 1 makes up 5-10% of the AP exam. That's a smaller slice than later units, but the concepts here, including scarcity, opportunity cost, comparative advantage, and supply and demand, show up as background knowledge throughout the entire exam, so a shaky foundation will cost you points later.
The AP Macro Unit 1 progress check includes MCQ and FRQ parts that draw from all 6 Unit 1 topics: Scarcity, Opportunity Cost and the Production Possibilities Curve, Comparative Advantage and Gains from Trade, Demand, Supply, and Market Equilibrium. MCQ questions typically ask you to interpret graphs or apply definitions, while the FRQ portion often asks you to draw or shift a production possibilities curve or explain a change in market equilibrium. Practice with matched questions at AP Macro Unit 1.
AP Macro Unit 1 FRQs most often focus on opportunity cost calculations, production possibilities curve shifts, and changes in market equilibrium. To practice, work through questions that ask you to draw a correctly labeled PPC, identify comparative advantage from a table, or trace how a supply or demand shift changes equilibrium price and quantity. For each response, write out your reasoning in full sentences, since partial credit depends on it. Find practice FRQs at AP Macro Unit 1.
The best place to find AP Macro Unit 1 practice questions, including multiple-choice and practice test sets, is AP Macro Unit 1. You'll find MCQs covering scarcity, opportunity cost, the production possibilities curve, comparative advantage, and supply and demand, plus FRQ practice targeting market equilibrium and PPC analysis.
Start with scarcity and opportunity cost, since every other concept in the unit builds on those two ideas. Then work through the production possibilities curve until you can draw, label, and shift it from memory. Move to comparative advantage, practice identifying it from a data table, and then tackle supply and demand shifts before putting it all together with market equilibrium. A solid study plan looks like this: 1. Read and take notes on each of the 6 topics in order. 2. Draw every graph by hand at least twice. 3. Do a timed set of MCQs after each topic to catch gaps. 4. Write out one FRQ response per major concept (PPC, equilibrium shifts). All of this is organized at AP Macro Unit 1.
AP Macro Unit 1 requires you to know two core graphs: the Production Possibilities Curve (PPC) and the supply and demand model. For the PPC, you need to draw it correctly labeled, identify points inside, on, and outside the curve, show economic growth by shifting it outward, and calculate opportunity cost from its slope. For supply and demand, you need to shift curves based on changes in determinants and identify the new equilibrium price and quantity. Both graphs appear on the progress check and in FRQs.