Theory of Justice and Economic Inequality

Rawls, Piketty, and Economic Thought

This section introduces key thinkers and concepts related to economic justice, wealth distribution, and the role of property rights in macroeconomics.

• John Rawls' Theory of Justice: Rawls proposed the idea of a "perfect wealth or middle class spread", emphasizing fairness and equality in the distribution of resources.

• Dominant Lottery: A concept used to illustrate fairness in the allocation of resources or opportunities.

• Thomas Piketty's "Capital": Piketty analyzes the dynamics of wealth accumulation and inequality, arguing that when the rate of return on capital () exceeds the rate of economic growth (), inequality increases.

• David Graeber's "Debt: The First 5000 Years": Explores the historical and social implications of debt and money.

• Ronald Coase: Emphasized the importance of property rights for efficient market outcomes. "As long as property rights are in your favor..."

• Adam Smith: Advocated for property rights and the role of self-interest in promoting economic prosperity.

• Market Power: The ability of a firm or individual to influence the price or quantity of goods in the market.

Additional info: These thinkers form the foundation for understanding how institutions and policies affect macroeconomic outcomes, especially regarding inequality and market efficiency.

Powerful Markets and Market Power

Market Equilibrium and Efficiency

Markets are considered powerful when they efficiently allocate resources, but market power can lead to inefficiencies.

• Market Power: Occurs when a firm can set prices above marginal cost (), leading to reduced consumer surplus and potential deadweight loss.

• Perfect Competition: In perfectly competitive markets, price equals marginal cost (), resulting in maximum efficiency.

• Economic Gain from Trade: There is an economic gain to the U.S. when immigrants move and work freely, as it increases the labor force and potential output.

Production Possibility Frontier (PPF) and Comparative Advantage

Trade, Opportunity Cost, and Specialization

The Production Possibility Frontier (PPF) illustrates the trade-offs and opportunity costs associated with allocating resources between different goods.

• PPF (Production Possibility Frontier): Shows the maximum possible output combinations of two goods that can be produced with available resources and technology.

• CPF (Consumption Possibility Frontier): Represents the combinations of goods that a country can consume, which can be expanded through trade.

• Gains from Trade: If trade is established, the CPF can lie outside the PPF, allowing for greater consumption than production alone would permit.

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

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

• Scarcity and Skills: Scarcity of resources and differences in skills drive comparative advantage and the benefits of trade.

Example: If Country A can produce either 10 units of corn or 5 units of computers, and Country B can produce either 8 units of corn or 8 units of computers, each country should specialize in the good for which it has a comparative advantage and trade for the other.

Market Diagrams and Analysis

Graphical Representations of Markets

Graphs are essential tools in macroeconomics for visualizing market outcomes, opportunity costs, and the effects of market power.

• PPF Curve: Typically concave, showing increasing opportunity costs as more of one good is produced.

• Market of Jet Packs: A hypothetical market used to illustrate market power. The diagram shows a downward-sloping demand curve and a marginal cost curve, with the monopolist setting a price above marginal cost.

• Market of Water: When a good is free (such as water in some contexts), the price is zero, and the quantity consumed is determined by demand alone.

Additional info: The diagrams referenced in the notes are standard in introductory macroeconomics and microeconomics, illustrating the effects of market structure on prices and quantities.

Key Formulas and Equations

Essential Mathematical Tools

• Marginal Cost (MC): The additional cost of producing one more unit of a good.

• Price Setting in Monopoly:

• Opportunity Cost:

• PPF Equation (linear case):

Example: If producing 1 more computer means giving up 2 units of corn, the opportunity cost of 1 computer is 2 corn.