Comprehensive Macroeconomics Study Guide and Exam Guide Notes and Exam Review Study Guide
Fiscal Policy and National Budgeting A country's government is defined as running a budget deficit when its annual government spending exceeds its tax revenues. This scenario distinguishes itself from other financial conditions such as whether the amount of new loans to developing nations exceeds the paid-off amount, or whether external debt to foreigners exceeds domestic debt. An increase in the government budget deficit is most likely to result in an increase in the real interest rate due to the increased demand for loanable funds. In the context of expansionary policy, a combination that is definitely expansionary involves an increase in government spending coupled with a decrease in taxes. Furthermore, an increase in income taxes is a specific action that would cause the aggregate demand curve to shift to the left. The increase in national income resulting from equal increases in government spending and taxes is best explained by the fact that consumers do not reduce their spending by the full amount of the tax increase, as their consumption is dictated by their marginal propensity to consume. # Consumption, Savings, and Multiplier Effects The marginal propensity to consume (MPC) represents the proportion of additional income that an individual consumes. A high marginal propensity to consume implies a low marginal propensity to save (MPS), as . In a closed economy with lump-sum taxes, the change in equilibrium gross domestic product resulting from autonomous investment spending is determined by the spending multiplier, calculated as . For example, if autonomous investment spending increases by and the marginal propensity to consume is , the multiplier is . Consequently, the equilibrium gross domestic product will change by a maximum of . In another instance, if an individual named Jane has an MPC of and her disposable income increases from in 2004 to in 2005, her consumption spending would increase by . # Monetary Theory, Banking Operations, and Money Supply The transaction demand for money is closely associated with money's role as a medium of exchange. The amount of cash the public chooses to hold typically decreases if interest rates increase, as the opportunity cost of holding non-interest-bearing cash rises. Money M1, the narrowest definition of the money supply, excludes savings accounts because they are not considered a direct medium of exchange. A commercial bank's ability to create money is fundamentally dependent on a fractional reserve banking system. Under a reserve requirement of , banks' lending capacities can be determined by their balance sheets. For Bank A (Assets: Actual reserves , Loans ; Liabilities: Demand deposits ), the bank has no excess reserves because its required reserves are exactly of its deposits. For Bank B (Assets: Actual reserves , Loans ; Liabilities: Demand deposits ), the required reserves are , meaning Bank B has in excess reserves and can increase its loans by that amount. For Bank C (Assets: Actual reserves , Loans ; Liabilities: Demand deposits ), the required reserves are , leaving no excess reserves. In terms of money creation, if a person deposits in cash into a checking account with a reserve requirement and no excess reserves are kept, the money supply can increase by a maximum of , which is the excess reserve of multiplied by the money multiplier of . Central bank actions such as an increase in reserve requirements will lead to a decrease in the money supply, whereas an open market purchase of government securities or a decrease in the discount rate would increase it. Specifically, if a central bank buys bonds through open-market operations, bond prices will increase and interest rates will decrease in the short run. # Economic Systems and Comparative Global Models A command economy is characterized by more centralized planning in economic decision-making, distinguishing it from a market economy which relies on price signals and consumer sovereignty to allocate resources. When evaluating international trade, the law of comparative advantage suggests that if two nations specialize and trade, each nation will increase its consumption possibilities. For example, considering a production table where Country A can produce computers and cars or computers and cars, and Country B can produce computers and cars or computers and cars: Country B has an absolute advantage in both goods. However, trade is beneficial based on comparative advantage. Country B has a comparative advantage in computers if its opportunity cost is lower than Country A's. # International Trade and Foreign Exchange Dynamics A country's currency value will tend to appreciate if demand for its exports increases. Conversely, the depreciation of the United States dollar would likely lead to an increase in United States exports as the goods become cheaper for foreign buyers. In a flexible exchange-rate system, the Indian rupee will appreciate against the Japanese yen if real interest rates in India increase relative to those in Japan. A country can increase the surplus in its balance of trade through declining imports and rising exports. Tariffs differ from import quotas as tariffs generate additional revenue for the domestic government while both restrict imports and increase prices. # Economic Growth, Productivity, and Production Possibilities Economic growth is often measured by an increase in real per capita gross domestic product, illustrating an improvement in a country's standard of living. Long-run growth is encouraged by subsidies to businesses for the purchase of capital goods, which increases the amount of capital per worker and output per worker. The production possibilities curve (PPC) represents the trade-offs between two types of goods, such as consumption and capital goods. Points on the curve (like W and X) represent full utilization of resources, while points inside the curve (like Z) represent underutilization. Choosing to produce more capital goods (at point X versus point W) typically results in greater future economic growth. Labor productivity is increased by improvements in physical capital, human capital, technological advancement, and educational achievement, but simply increasing the total labor force is the least likely to increase the productivity of each individual worker. # Labor Market Dynamics and Unemployment The official unemployment rate is often considered to understate the true level of unemployment because it ignores underemployed individuals and discouraged workers who have stopped looking for work. Frictional unemployment is illustrated by individuals like Pat, who recently left a job to look for a different job in another town. In contrast, individuals who have given up looking for work (Chris), full-time students (Kim), retirees (Leslie), or part-time workers seeking full-time work (Lee) are categorized differently; only Pat fits the definition of those actively seeking while between jobs. The short-run Phillips curve demonstrates that lower inflation rates are typically associated with higher unemployment rates. # Aggregate Demand, Aggregate Supply, and Macroeconomic Equilibrium In the circular flow of income and production, households serve as the suppliers of resources and consumers of goods and services, while businesses use these resources to produce. Aggregate Demand (AD) and Short-Run Aggregate Supply (SRAS) determine the price level and output. If a reduction in AS is followed by an increase in AD, the price level will definitely increase, though the effect on output is indeterminate. An adverse supply shock, such as a drought, will most likely cause an increase in the price level and a decrease in the real wage in the short run. Policies intended to reduce demand-pull inflation, like contractionary fiscal or monetary policy, are most likely to increase unemployment in the short run. If an economy is operating below full employment with low inflation, the central bank may pursue expansionary policy by lowering the discount rate and buying bonds on the open market. In the long run, if economic agents perfectly anticipate policy changes and all prices and wages are flexible, there is no trade-off between inflation and unemployment. # National Income Accounting and GDP The Gross Domestic Product (GDP) can be calculated using the following figures: Consumption (\$3,000\,billion), Government purchases (\$1,000\,billion), Gross private domestic investment (\$700\,billion), Exports (\$300\,billion), and Imports (\$500\,billion). The value of GDP is calculated as , which equals . # Inflation, Price Indexes, and Expectations Hyperinflation is typically caused by the continuous expansion of the money supply, often to finance government budget deficits. The Consumer Price Index (CPI) is designed to measure changes in the cost of a select market basket of goods and services. Unanticipated inflation does not affect everyone equally; it specifically increases the economic well-being of net debtors, who pay back loans with less valuable currency, while hurting net creditors. A simultaneous increase in inflation and unemployment, known as stagflation, could be explained by an increase in inflationary expectations or a decrease in aggregate supply. Monetary policy becomes more effective at changing real GDP as investment becomes more responsive to changes in interest rates. Advocates of a monetary rule recommend that the money supply should increase at a rate equal to the rate of increase in long-run real gross domestic product.
A budget deficit occurs when annual government spending exceeds tax revenues.
An increase in the government budget deficit likely leads to an increase in real interest rates due to higher demand for loanable funds.
Expansionary policy combines increased government spending with decreased taxes.
Increasing income taxes shifts the aggregate demand curve to the left.
The increase in national income from equal increases in government spending and taxes occurs because consumers do not fully reduce their spending based on tax increases, reflecting their marginal propensity to consume.
The marginal propensity to consume (MPC) indicates the portion of additional income that is consumed, inversely related to the marginal propensity to save (MPS) as .
In a closed economy, the spending multiplier is determined by the formula .
For example, an increase in autonomous investment spending of million with an MPC of results in a maximum GDP change of .
If Jane has an MPC of and her disposable income increases from to , her consumption increases by .
The transaction demand for money decreases as interest rates rise since the opportunity cost of holding cash increases.
Money M1 defines the money supply excluding savings accounts, focusing on cash as a medium of exchange.
A fractional reserve banking system dictates how much money banks can create based on reserves.
Bank A shows no excess reserves (Assets: Actual reserves , Loans ).
Bank B has in excess reserves and can increase its loans by that amount (Assets: Actual reserves , Loans ).
In terms of money creation, a deposit of with a reserve requirement can increase the money supply by a maximum of .
Central bank actions like raising reserve requirements decrease the money supply while buying bonds increases it.
The advantages of trade arise from comparative advantage, prompting nations to specialize for increased consumption possibilities.