Introduction to Economics

Scarcity and Opportunity Cost

Economics is the study of how individuals and societies allocate limited resources to satisfy unlimited wants. Two foundational concepts are scarcity and opportunity cost.

• Scarcity: The fundamental economic problem of having seemingly unlimited human wants in a world of limited resources.

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

• Example: Choosing to attend college means giving up the income you could have earned working full-time.

Production Possibilities and Comparative Advantage

Production Possibilities Frontier (PPF)

The Production Possibilities Frontier (PPF) illustrates the maximum feasible combinations of two goods that an economy can produce given its resources and technology.

• Points on the PPF: Efficient production points.

• Points inside the PPF: Inefficient use of resources.

• Points outside the PPF: Unattainable with current resources.

Equation:

$\text{Opportunity Cost of Good X} = \frac{\text{Loss of Good Y}}{\text{Gain of Good X}}$

Comparative Advantage

Comparative advantage occurs when an individual or country can produce a good at a lower opportunity cost than another.

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

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

• Example: If Country A can produce wheat at a lower opportunity cost than Country B, Country A has a comparative advantage in wheat.

Gains from Trade and Demand

Gains from Trade

Trade allows individuals and nations to specialize in the production of goods for which they have a comparative advantage, leading to increased overall efficiency and consumption possibilities.

• Specialization: Focusing on the production of goods with the lowest opportunity cost.

• Mutual Benefit: Both parties can consume more than they could without trade.

Demand

Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices over a given period.

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

• Demand Curve: Downward sloping, showing the inverse relationship between price and quantity demanded.

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

Demand and Supply; Market Equilibrium

Supply

Supply is the quantity of a good or service that producers are willing and able to sell at various prices over a given period.

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

• Supply Curve: Upward sloping, showing the direct relationship between price and quantity supplied.

• Determinants of Supply: Input prices, technology, expectations, number of sellers, government policies.

Market Equilibrium

Market equilibrium occurs where the quantity demanded equals the quantity supplied at a particular price.

• Equilibrium Price: The price at which quantity demanded equals quantity supplied.

• Equilibrium Quantity: The quantity bought and sold at the equilibrium price.

• Shifts: Changes in demand or supply shift the equilibrium price and quantity.

Equation:

$Q_d = Q_s$

Elasticity and Business Pricing Decisions

Price Elasticity of Demand

Elasticity measures the responsiveness of quantity demanded or supplied to changes in price or other factors.

• Price Elasticity of Demand: The percentage change in quantity demanded divided by the percentage change in price.

Equation:

$\text{Price Elasticity of Demand} = \frac{\% \text{ Change in Quantity Demanded}}{\% \text{ Change in Price}}$

• Elastic Demand: Elasticity > 1 (quantity demanded is sensitive to price changes).

• Inelastic Demand: Elasticity < 1 (quantity demanded is not very sensitive to price changes).

• Unit Elastic: Elasticity = 1.

Business Pricing Decisions

Understanding elasticity helps businesses set prices to maximize revenue. If demand is elastic, lowering price increases total revenue; if inelastic, raising price increases total revenue.

Course Schedule Table

The following table summarizes the course schedule and topics: