Scarcity and the Foundations of Economics

Scarcity and Choice

Scarcity is the fundamental economic problem arising from limited resources and unlimited wants. It forces individuals, businesses, and governments to make choices about how to allocate resources.

• Scarcity: The inability to satisfy all our wants due to limited resources such as time, income, and prices.

• Economics: The social science that studies the choices made to cope with scarcity.

• Microeconomics: Focuses on individual and business choices and their interactions, including government effects.

• Macroeconomics: Studies aggregate effects on the national economy.

What, How, and For Whom?

Economics addresses three central questions:

• What? Determines the quantities of goods and services produced.

• How? Refers to the methods and resources used in production.

• For Whom? Identifies who receives the goods and services.

Key Economic Ideas

• Choice is a Tradeoff: Every choice involves giving up one thing to get another.

• Opportunity Cost: The best alternative forgone when making a choice.

• Benefit: The gain or pleasure measured by what you are willing to give up.

• Rational Choice: Comparing costs and benefits to select the best option.

• Choosing at the Margin: Decisions made by comparing incremental costs and benefits.

• Incentives: Rewards or penalties that influence choices ("carrot" for positive, "stick" for negative).

Economic Models

Economic models are simplified representations used to predict consumer behavior and outcomes based on marginal analysis.

The US and Global Economies

Types of Goods and Services

• Consumption Goods and Services: Bought by individuals for personal enjoyment and standard of living (e.g., movie tickets).

• Capital Goods: Bought by businesses to increase productive resources (e.g., seats in a movie theater).

Factors of Production

Resources used to produce goods and services:

• Land: Natural resources (water, air, oil, animals).

• Labor: Time and effort people devote to production.

• Human Capital: Knowledge and skills from education or training.

• Capital: Tools, machines, buildings, and other items produced in the past and used for current production.

• Entrepreneurship: Organizes land, labor, and capital; innovates new products and ideas.

Distribution of Income

• Rent: Income paid for land.

• Wages: Income paid for labor.

• Interest: Income paid for capital.

• Profit (or Loss): Income earned by entrepreneurs.

• Functional Distribution of Income: Distribution among factors of production.

• Personal Distribution of Income: Distribution among households.

The Economic Problem

Production Possibilities Frontier (PPF)

The PPF illustrates the boundary between attainable and unattainable combinations of goods and services, highlighting scarcity and tradeoffs.

• PPF: Shows possible production combinations; points inside or on the frontier are attainable, outside are unattainable.

• Production Efficiency: Achieved when more of one good cannot be produced without less of another.

• Inefficient Production: Occurs inside the PPF; resources are underutilized.

• Free Lunch: Getting something without giving up anything else (rare in economics).

Opportunity Cost

Opportunity cost quantifies tradeoffs and is represented by the slope of the PPF.

• Opportunity Cost: What you give up divided by what you get.

• For two goods, the opportunity cost of one is the quantity of the other forgone per unit gained.

Formula:

Economic Growth

Economic growth expands production possibilities, shifting the PPF outward.

• Driven by technological improvements, better labor quality, and increased capital.

• Allows for more consumption and capital goods.

Specialization and Trade

• Absolute Advantage: Ability to produce more output with fewer inputs.

• Comparative Advantage: Ability to produce at a lower opportunity cost.

Example: Liz can produce 30 smoothies or 30 salads in an hour (opportunity cost of 1 smoothie = 1 salad). Joe can produce 6 smoothies or 30 salads (opportunity cost of 1 smoothie = 5 salads). Liz has the comparative advantage in smoothies.

Markets: Demand and Supply

Market and Competitive Market

A market brings buyers and sellers together. In a competitive market, no single buyer or seller can influence prices.

Demand

• Quantity Demanded: Amount buyers are willing and able to purchase at a specific price.

• Law of Demand: As price rises, quantity demanded falls; as price falls, quantity demanded rises.

• Change in Quantity Demanded: Caused by price changes.

• Change in Demand: Caused by factors other than price (e.g., income, preferences).

Factors Affecting Demand

• Prices of Related Goods: Substitutes (increase demand if substitute price rises), Complements (increase demand if complement price falls).

• Expected Future Prices: Anticipation of price changes affects current demand.

• Income: Normal goods (demand rises with income), Inferior goods (demand falls with income).

• Number of Buyers: More buyers increase demand.

• Preferences: Changes can increase or decrease demand.

Supply

• Quantity Supplied: Amount sellers are willing and able to sell at a specific price.

• Law of Supply: As price rises, quantity supplied rises; as price falls, quantity supplied falls.

• Supply Schedule: Table of quantities supplied at different prices.

• Supply Curve: Graphical representation of supply.

• Market Supply: Sum of all sellers' quantities supplied.

• Change in Quantity Supplied: Caused by price changes.

• Change in Supply: Caused by factors other than price (e.g., input prices, number of sellers).

Factors Affecting Supply

• Price of Related Goods: Substitutes in production can affect supply.

• Prices of Resources and Inputs: Higher input prices decrease supply.

• Expected Future Prices: Anticipation of price changes affects current supply.

• Number of Sellers: More sellers increase supply.

• Productivity: Higher productivity increases supply.

Market Equilibrium

• Equilibrium: Quantity demanded equals quantity supplied.

• Equilibrium Price: Price at which equilibrium occurs.

• Equilibrium Quantity: Quantity bought and sold at equilibrium price.

• Law of Market Forces: Shortage causes price to rise; surplus causes price to fall.

Elasticities of Demand and Supply

Price Elasticity of Demand

Measures responsiveness of quantity demanded to price changes.

• Formula:

• Elastic Demand: Elasticity > 1; quantity demanded changes more than price.

• Inelastic Demand: Elasticity < 1; quantity demanded changes less than price.

• Unit Elastic: Elasticity = 1; proportional change.

• Perfectly Inelastic: Elasticity = 0; no change in quantity demanded.

• Total Revenue:

Factors Influencing Price Elasticity of Demand

• Proportion of income spent

• Availability of substitutes

• Luxury vs. necessity

• Narrowness of definition

• Time elapsed since price change

Price Elasticity of Supply

Measures responsiveness of quantity supplied to price changes.

• Formula:

• Elastic Supply: Elasticity > 1

• Unit Elastic Supply: Elasticity = 1

• Inelastic Supply: Elasticity < 1

• Perfectly Inelastic Supply: Elasticity = 0

Factors Influencing Price Elasticity of Supply

• Production possibility (constant opportunity cost)

• Storage possibilities (storable goods are more elastic)

• Time elapsed since price change (supply becomes more elastic over time)

Cross Elasticity of Demand

Measures how demand for a good changes when the price of a substitute or complement changes.

• Formula:

• Substitutes: Cross elasticity > 0 (quantity demanded and price of substitute move in same direction).

• Complements: Cross elasticity < 0 (quantity demanded and price of complement move in opposite directions).

Income Elasticity of Demand

Measures how demand for a good changes as income changes.

• Normal Goods: Positive income elasticity (demand increases as income increases).

• Inferior Goods: Negative income elasticity (demand decreases as income increases).

Summary Table: Elasticity Classifications

Additional info: Academic context and examples were added to clarify definitions and formulas, and to ensure completeness for exam preparation.