Topics: economic problem, scarcity, choice, demand, supply, market equilibrium, market system, household behavior, consumer choice, production process, short-run costs, output decisions, input demand, labor, land market, capital market, investment decision, general equilibrium, market imperfection, monopoly, antitrust policy, oligopoly, monopolistic competition, externalites, public goods, uncertainty, asymmetric information, income distribution, poverty, public finance, taxation, macroeconomics, national output, national income, Unemployment, Inflation, Long-Run Growth, aggregate expenditure, equilibrium output, government policy, fiscal policy, money, federal rreserve, interest rate, aggregate output, price level, labor market, macroeconomic theory, financial crises, stabilization, deficit, long-run growth, world economy, international trade, comparative advantage, protectionism, open-economy macroeconomics, economic growth