AP Macroeconomics Unit 1 – Basic Economic Concepts: Ultimate Study Notes

Scarcity, Choice, and Opportunity Cost

Scarcity

  • Resources are limited, wants are unlimited → forces trade-offs.

  • Types of resources:

    • Land – natural resources

    • Labor – human effort

    • Capital – machinery, tools

    • Entrepreneurship – innovation & risk-taking

AP Tip

  • Scarcity exists all the time, not just during crises.

Memory Trick

  • S.L.C.E. → Scarcity Limits Choices Everytime

Opportunity Cost

  • Definition: Value of the next best alternative foregone.

  • Formula (informal): Opportunity Cost = What you give up / What you gain

AP Tip

  • Opportunity cost ≠ money spent; it’s about foregone alternatives.

Memory Trick

  • “Next best thing” = Opportunity Cost

Trade-Offs

  • Every choice involves giving up something else.

  • Example: Studying for AP Macro → trade-off is leisure time.

Production Possibilities Curve (PPC)

PPC Basics

  • Graph showing maximum output combinations of two goods/services.

  • Illustrates scarcity, trade-offs, and opportunity costs.

  • Key points:

    • Inside the curve → inefficient use of resources

    • On the curve → efficient use

    • Outside the curve → unattainable with current resources

Memory Trick

  • “Inside = lazy, On = optimal, Outside = out of reach”

PPC Shifts

  • Outward shift: economic growth (more resources, better technology)

  • Inward shift: disaster or resource loss

AP Tip

  • Ask: “Are we producing efficiently?” before analyzing shifts.

Law of Increasing Opportunity Cost

  • Resources are not perfectly adaptable → producing more of one good increases opportunity cost.

  • PPC is concave (bowed out).

Memory Trick

  • “Bow Out for Cost” → more of one thing costs more of the other.

Economic Systems

Types of Economies

  1. Traditional – Decisions based on custom, habit, ritual. Low innovation.

  2. Command (Planned) – Government decides production, prices, allocation. Example: North Korea

  3. Market (Capitalist) – Decisions made by individuals/firms; driven by profit motive. Example: United States

  4. Mixed – Combination of market & government intervention; most modern economies

AP Tip

  • Be ready to classify real-world examples of economies.

Memory Trick

  • T-C-M-M → Traditional, Command, Market, Mixed

Positive vs. Normative Economics

Positive Economics

  • Describes facts, “what is”

  • Example: Inflation rate is 3%

Normative Economics

  • Opinions, “what ought to be”

  • Example: Inflation should be lower

AP Tip

  • FRQs often test if statements are positive or normative.

Memory Trick

  • P = fact, N = opinion → “Positive = Provable, Normative = Not provable”

Marginal Thinking

Definition

  • Decision-making based on additional cost and benefit.

  • Rational decision: Marginal Benefit ≥ Marginal Cost

Memory Trick

  • Marginal = Extra; weigh extra benefit vs. extra cost.

Economic Goals

Key Goals

  • Efficiency: Resources used optimally

  • Equity: Fair distribution of wealth

  • Growth: Increase in output (PPC shifts outward)

  • Stability: Low inflation & unemployment

AP Tip

  • Efficiency ≠ equity – classic AP trap.

  • Always relate goals to PPC shifts and trade-offs.

Key Terms to Remember

  • Scarcity

  • Choice

  • Opportunity Cost

  • Trade-Offs

  • PPC (efficient, inefficient, unattainable)

  • Law of Increasing Opportunity Cost

  • Economic Systems (Traditional, Command, Market, Mixed)

  • Positive vs. Normative Economics

  • Marginal Cost/Benefit

Memory Trick

  • S.C.O.T.P.E.M.P. → Scarcity, Choice, Opportunity cost, Trade-offs, PPC, Economic systems, Marginal thinking, Positive vs Normative