Deadweight Loss: Welfare Cost of Market Distortions
Deadweight loss is the welfare triangle that disappears when taxes, tariffs, monopolies, or price controls cut off mutually beneficial trade...
microeconomics
Core of an Exchange Economy: Blocking Coalitions
core of an exchange economy analysis explains how blocking coalitions restrict feasible trades and why competitive markets shrink the stable...
Contract Curve: Pareto Efficient Allocations
contract curve analysis derives Pareto-efficient allocations in an Edgeworth box by equating two agents’ marginal rates of substitution at tangency...
Giffen Goods: When Demand Curves Slope Upward
Giffen goods are inferior staples whose demand rises with price because the income effect overwhelms substitution. Jensen and Miller's 2008...
Marginal Rate of Substitution: Slope, Concavity, and Choice
The marginal rate of substitution is the slope of the indifference curve at a point and the ratio of marginal...
Hicksian vs Marshallian Demand: Two Curves, One Consumer
Hicksian vs Marshallian demand is the central duality of consumer theory. One holds income constant for empirical work; the other...
Repeated Games and Folk Theorem: How Cooperation Emerges Without Contracts
Repeated Games and Folk Theorem explains how patience, punishment, and reputation sustain cooperation when formal contracts cannot enforce behaviour.
Roy’s Identity and Shephard’s Lemma: Recovering Demand from Utility and Cost
Roy's Identity and Shephard's Lemma are the duality results that recover Marshallian and Hicksian demand from indirect utility and expenditure...
Hotelling Rule: Pricing Non-Renewable Resources Over Time
The Hotelling Rule states that the net price of an exhaustible resource must rise at the real interest rate, the...
Kuhn-Tucker Conditions: Optimisation with Inequality Constraints
The Kuhn-Tucker Conditions extend Lagrangian optimisation to inequality constraints through complementary slackness, the principle that supports modern microeconomics, finance, and...