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Circular Flow Model : : Lets Simplify It. Private Sector Circular Flow. Private and Public Sectors. Private sector: households, businesses, & the international sector. Household spending “consumption”. Business spending on capital goods and inventories “investment”.
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Private and Public Sectors • Private sector: households, businesses, & the international sector. • Household spending “consumption”. • Business spending on capital goods and inventories“investment”. • Sales of goods and services to foreigners “exports.” Purchases from foreigners “imports.” • Public sector: government activities.
Income Distribution in Market Economy What you own What you get • Firms pay the factors of production according to their marginal products • Workers get wages equal to the marginal product of labor. • Capitalists get interest equal to the marginal product of capital. • Landlordsgetrents equal to the marginal product of land. • Entrepreneurs get profits equal to the excess of revenues over costs (payments to other factors).
Private Sector Circular FlowY = Income earned from contributing to production = Wages + Interest + Rents + Profits = Receipts of FirmsY = Receipts = C + I + NX = Hshld Spending + SavingC + S = C + I + NX S = I + NX
The Government’s Role Correct for: • Imperfect Information • Externalities • Public Goods • Lack of Competition • Business Cycles
Public Goods • Consumption by one person does not diminish the quantity or quality available to others. • Public goods can be jointly consumed • Public goods are non-excludable • No one has a private property right to a public good. • Everybody has incentive to be a free rider • When everyone free rides, too little (or none) is produced.
Macroeconomic PolicyMacro Stability: A Public Good • Monetary Policy • Policies that influence money and credit (money supply and interest rates). • In the U.S., the Federal Reserve Board (“the Fed”) is responsible for this. • Fiscal Policy • Policies that control government spending and taxation. • In the U.S. federal government, Congress enacts these policies and the President signs them into law.
Federal, State, and Local Government Expenditures for Goods and Services