Practice Test #1: Foundations of Introductory Macroeconomics

Foundations of Economics

Basic Economic Concepts

Economics studies how individuals and societies allocate scarce resources to satisfy unlimited wants. The foundational concepts include scarcity, opportunity cost, and rational decision-making.

• Scarcity: The fundamental economic problem of having limited resources to meet unlimited wants.

• Opportunity Cost: The value of the next best alternative foregone when making a choice.

• Rationality: Economists assume that individuals act rationally, weighing costs and benefits to maximize utility.

• Production Possibilities Frontier (PPF): A curve showing the maximum attainable combinations of two products that may be produced with available resources and technology.

Example: If a country can produce either 100 units of wheat or 200 units of corn, the opportunity cost of producing 1 unit of wheat is 2 units of corn.

Trade-offs, Comparative Advantage, and the Market System

Production Possibilities and Trade

The PPF illustrates trade-offs and opportunity costs. Points inside the PPF are attainable but inefficient, points on the PPF are efficient, and points outside are unattainable.

• Constant vs. Increasing Opportunity Cost: If the PPF is linear, opportunity costs are constant. If bowed out, opportunity costs increase as more of one good is produced.

• Comparative Advantage: The ability to produce a good at a lower opportunity cost than another producer.

• Absolute Advantage: The ability to produce more of a good with the same resources than another producer.

Example: If Serena can make 14 bracelets or 7 necklaces per week, and Haley can make 8 bracelets or 8 necklaces, Serena has an absolute advantage in bracelets, but Haley has a comparative advantage in necklaces.

Specialization and Gains from Trade

• Specialization according to comparative advantage allows for increased total output and mutual gains from trade.

• The terms of trade must fall between the opportunity costs of the two trading parties.

Demand and Supply: Market Equilibrium

Demand and Supply Curves

The interaction of demand and supply determines market prices and quantities.

• Law of Demand: As the price of a good falls, the quantity demanded rises, ceteris paribus.

• Law of Supply: As the price of a good rises, the quantity supplied increases, ceteris paribus.

• Market Equilibrium: The point where the quantity demanded equals the quantity supplied.

Equation Example:

• Demand: $Q_d = 50 - 2P$

• Supply: $Q_s = 3P$

• At equilibrium: $Q_d = Q_s$

Shifts in Demand and Supply

• Demand Shifters: Income, tastes, prices of related goods, expectations, number of buyers.

• Supply Shifters: Input prices, technology, expectations, number of sellers.

• A shift in the curve means a change in demand or supply; a movement along the curve is a change in quantity demanded or supplied.

Example: An increase in the price of inputs shifts the supply curve leftward, leading to a higher equilibrium price and lower equilibrium quantity.

Market Surpluses and Shortages

• Surplus: When quantity supplied exceeds quantity demanded at a given price.

• Shortage: When quantity demanded exceeds quantity supplied at a given price.

Example: If the price is set above equilibrium, a surplus results; if below, a shortage occurs.

Tables and Figures

Production Possibilities Table

The following table illustrates production choices for a hypothetical pizzeria:

Choice	Quantity of Pizzas Produced	Quantity of Calzones Produced
A	40	0
B	36	10
C	28	20
D	16	30
E	0	40

Additional info: This table demonstrates opportunity cost and the trade-offs involved in allocating resources between two goods.

Comparative Advantage Table

Output per week for two jewelers:

	Serena	Haley
Bracelets	14	8
Necklaces	7	8

Additional info: This table is used to calculate opportunity costs and determine comparative advantage.

Key Definitions and Concepts

• Normal Good: A good for which demand increases as income rises.

• Inferior Good: A good for which demand decreases as income rises.

• Substitute Good: A good that can replace another in consumption.

• Complementary Good: A good that is consumed with another good.

• Factor of Production: Inputs used to produce goods and services (land, labor, capital, entrepreneurship).

• Model: A simplified representation of reality used to analyze economic situations.

Application and Analysis

• Changes in technology, resource availability, or policy can shift the PPF outward, representing economic growth.

• Market equilibrium can be disrupted by external shocks, leading to temporary surpluses or shortages until a new equilibrium is reached.

• Understanding opportunity cost and comparative advantage is essential for analyzing trade and specialization both within and between nations.