- GDP
- Gross domestic product: the market value of all final goods and services produced within a country in a given period.
- Scarcity
- The basic economic problem: unlimited wants but limited resources, forcing trade-offs.
- Opportunity cost
- The value of the next-best alternative given up when a choice is made.
- Spending multiplier
- 1 ÷ (1 − MPC), or 1 ÷ MPS. If MPC = 0.8, the multiplier is 5.
- Inflation
- A sustained rise in the general price level, reducing the purchasing power of money.
- Phillips curve
- Short-run: a downward-sloping inflation–unemployment trade-off. Long-run: vertical at the natural rate of unemployment.
- Crowding out
- Government deficit borrowing raises the real interest rate and reduces private investment.
- Exchange rate
- The price of one currency in terms of another, set by supply and demand in the foreign exchange market.
- Production possibilities curve (PPC)
- A graph of the maximum combinations of two goods an economy can produce. Inside = inefficient, on = efficient, outside = unattainable now.
- Comparative advantage
- The ability to produce a good at a lower opportunity cost than another producer. It drives gains from trade.
- Absolute advantage
- The ability to produce more of a good than another producer using the same resources.
- Law of demand
- As the price of a good rises, the quantity demanded falls, all else equal (inverse relationship).
- Law of supply
- As the price of a good rises, the quantity supplied rises, all else equal (direct relationship).
- Market equilibrium
- The price and quantity where the demand and supply curves intersect; the market clears with no shortage or surplus.
- Shortage
- When the price is below equilibrium so quantity demanded exceeds quantity supplied; price tends to rise.
- Surplus
- When the price is above equilibrium so quantity supplied exceeds quantity demanded; price tends to fall.
- Marginal analysis
- Comparing the marginal benefit and marginal cost of an action; do it while MB > MC, stop where MB = MC.
- Factors of production
- Land, labor, capital, and entrepreneurship — the resources used to produce goods and services.
- Increasing opportunity cost
- Why the PPC is bowed outward: resources are not equally suited to all goods, so producing more of one costs increasingly more of the other.
- Normative vs positive economics
- Positive statements describe what is (testable); normative statements express what ought to be (opinion/value).
- Capital good
- A manufactured resource (machinery, tools, factories) used to produce other goods, not consumed directly.
- Specialization
- Concentrating production on the goods for which a producer has a comparative advantage, then trading.
- Terms of trade
- The rate at which two goods are exchanged; mutually beneficial trade occurs between the two producers' opportunity costs.
- Allocative efficiency
- Producing the combination of goods most valued by society — where marginal benefit equals marginal cost.
- Productive efficiency
- Producing at the lowest possible cost, on the PPC rather than inside it.
- Determinants of demand
- Tastes, income, prices of related goods, expectations, and number of buyers — shifters of the demand curve.
- Determinants of supply
- Input prices, technology, taxes/subsidies, expectations, and number of sellers — shifters of the supply curve.
- Substitute vs complement
- Substitutes can replace each other (tea/coffee); complements are used together (cars/gas).
- Normal vs inferior good
- Demand for a normal good rises with income; demand for an inferior good falls as income rises.
- Gains from trade
- The total output and consumption that two parties achieve by specializing per comparative advantage and trading, beyond what they could alone.
- Resource market vs product market
- In the circular flow, households sell resources in the resource market and buy goods in the product market; firms do the reverse.
- Circular flow model
- A diagram showing the flow of resources, goods, and money between households and firms (and the government and foreign sectors).
- Real GDP
- GDP valued at constant base-year prices; it measures changes in actual output, removing inflation.
- Nominal GDP
- GDP valued at current-year prices; it rises with both output and inflation.
- Expenditure approach to GDP
- GDP = C + I + G + NX (consumption + investment + government + net exports).
- What is excluded from GDP
- Intermediate goods, used goods, purely financial transactions (stocks/bonds), and transfer payments.
- GDP deflator
- A price index = (nominal GDP ÷ real GDP) × 100; it measures the price level of all goods in GDP.
- Unemployment rate
- Unemployed ÷ labor force × 100. The labor force = employed + unemployed (actively seeking work).
- Labor force
- All people 16+ who are employed or unemployed and actively seeking work; excludes those not looking.
- Labor force participation rate
- Labor force ÷ working-age population × 100.
- Frictional unemployment
- Short-term unemployment from people moving between jobs or newly entering the labor force.
- Structural unemployment
- Unemployment from a mismatch of skills or location, often due to technology or shifts in the economy.
- Cyclical unemployment
- Unemployment caused by a downturn in the business cycle; it is zero at full employment.
- Natural rate of unemployment
- Frictional + structural unemployment — the rate that exists at full employment (cyclical = 0).
- Full employment
- The level of output where only the natural rate of unemployment remains; the economy produces potential GDP.
- Consumer price index (CPI)
- The average change over time in prices of a fixed market basket bought by a typical urban household; the main inflation gauge.
- Inflation rate formula
- (New CPI − old CPI) ÷ old CPI × 100.
- Demand-pull inflation
- Inflation caused by rising aggregate demand pulling up the price level.
- Cost-push inflation
- Inflation caused by rising production costs (a leftward SRAS shift), raising prices and lowering output.
- Deflation
- A sustained fall in the general price level (a negative inflation rate).
- Disinflation
- A decrease in the inflation rate — prices still rise, but more slowly.
- Real vs nominal interest rate
- Real interest rate = nominal interest rate − inflation rate (the Fisher equation).
- Who is hurt by unexpected inflation
- Lenders, savers, and those on fixed incomes lose; borrowers and the government (with fixed-rate debt) tend to gain.
- Business cycle
- Fluctuations of real GDP around its long-run trend: expansion → peak → contraction (recession) → trough.
- Recession
- A significant decline in economic activity, commonly two consecutive quarters of falling real GDP.
- Peak
- The top of the business cycle, where real GDP is highest before a contraction begins.
- Trough
- The bottom of the business cycle, where real GDP is lowest before an expansion begins.
- Aggregate income = aggregate output
- In the circular flow, total spending equals total income equals total output; GDP can be measured by either.
- Underemployment
- Working part-time or below one's skill level when full-time, skill-appropriate work is desired; not counted as unemployed.
- Discouraged workers
- People who have stopped looking for work; they leave the labor force, which can lower the measured unemployment rate.
- Real GDP per capita
- Real GDP ÷ population; a common measure of a country's average standard of living.
- Price index
- A measure of the price level relative to a base year (set to 100), used to convert nominal to real values.
- Hyperinflation
- Extremely rapid inflation that destroys money's value as a store of value and medium of exchange.
- Aggregate demand (AD)
- Total real output demanded at each price level: C + I + G + NX. It slopes downward and shifts when a component changes.
- Why AD slopes downward
- The wealth effect, the interest-rate effect, and the net-exports effect of a changing price level.
- AD shifters
- Changes in consumption, investment, government spending, or net exports (and the money supply via interest rates).
- Short-run aggregate supply (SRAS)
- Upward-sloping: a higher price level raises real output in the short run because some input prices are sticky.
- Long-run aggregate supply (LRAS)
- Vertical at full-employment (potential) output; the price level does not affect long-run output.
- SRAS shifters
- Input/resource prices, productivity, and supply shocks shift SRAS; rising costs shift it left.
- Marginal propensity to consume (MPC)
- The fraction of each additional dollar of disposable income that is spent. MPC + MPS = 1.
- Marginal propensity to save (MPS)
- The fraction of each additional dollar of disposable income that is saved. MPS = 1 − MPC.
- Spending multiplier formula
- 1 ÷ (1 − MPC) = 1 ÷ MPS. A larger MPC means a larger multiplier.
- Tax multiplier
- −MPC ÷ (1 − MPC). It is smaller in size than the spending multiplier and negative.
- Balanced-budget multiplier
- Equals 1: an equal increase in government spending and taxes raises real GDP by that same amount.
- Recessionary gap
- When equilibrium real GDP is below full-employment output (LRAS); calls for expansionary fiscal policy.
- Inflationary gap
- When equilibrium real GDP is above full-employment output; calls for contractionary fiscal policy.
- Expansionary fiscal policy
- Increasing government spending or cutting taxes to shift AD right and close a recessionary gap.
- Contractionary fiscal policy
- Decreasing government spending or raising taxes to shift AD left and close an inflationary gap.
- Long-run macroeconomic equilibrium
- Where AD, SRAS, and LRAS intersect at full-employment output, with no output gap.
- The multiplier effect
- An initial change in spending leads to a larger change in real GDP, because one person's spending is another's income, spent again.
- Automatic stabilizers
- Taxes and transfers (like unemployment benefits) that automatically dampen the business cycle without new legislation.
- Discretionary fiscal policy
- Deliberate changes in government spending or taxes by Congress and the President to influence the economy.
- Supply shock
- A sudden change in input costs that shifts SRAS; a negative shock (e.g., oil price spike) raises prices and lowers output (stagflation).
- Sticky prices/wages
- Prices and wages that adjust slowly, which is why SRAS slopes upward and short-run output gaps can persist.
- Self-correction (long run)
- Without policy, an output gap closes as wages/prices adjust and SRAS shifts, returning output to LRAS.
- Investment (I) in GDP
- Business spending on capital, new residential construction, and changes in inventories — not the purchase of stocks.
- Government spending (G) in GDP
- Government purchases of goods and services; it excludes transfer payments like Social Security.
- Consumption (C) in GDP
- Household spending on goods and services — the largest component of GDP.
- Stagflation
- Simultaneous high inflation and high unemployment (falling output), typically from a negative supply shock.
- Three functions of money
- Medium of exchange, unit of account, and store of value.
- Medium of exchange
- Money's function of being accepted in trade for goods and services, avoiding barter.
- Unit of account
- Money's function of providing a common measure of value (a price tag).
- Store of value
- Money's function of holding purchasing power over time so you can save and spend later.
- M1
- The most liquid money: currency in circulation plus checkable (demand) deposits.
- M2
- M1 plus less-liquid near-money such as savings deposits, small time deposits, and money market funds.
- Fractional reserve banking
- Banks hold only a fraction of deposits as reserves and lend out the rest, expanding the money supply.
- Required reserves
- The portion of deposits a bank must hold (not lend), set by the required reserve ratio.
- Excess reserves
- Reserves a bank holds above its required reserves; these can be lent out to create money.
- Money multiplier
- 1 ÷ required reserve ratio; the maximum money the banking system can create from new reserves.
- Required reserve ratio
- The fraction of deposits banks must keep as reserves rather than lend.
- Money market
- The market where the nominal interest rate is set by a vertical money supply and downward-sloping money demand.
- Money supply (MS) curve
- Vertical, set by the central bank; it does not depend on the interest rate.
- Money demand (MD) curve
- Downward-sloping: at lower interest rates, the opportunity cost of holding money falls, so people hold more.
- Monetary policy
- The central bank's control of the money supply and interest rates to influence the economy.
- Open-market operations
- The central bank buying or selling government bonds to change reserves and the money supply.
- Buying bonds (open market)
- Expansionary: it increases reserves and the money supply, lowering interest rates.
- Selling bonds (open market)
- Contractionary: it decreases reserves and the money supply, raising interest rates.
- Discount rate
- The interest rate the central bank charges banks for short-term loans; raising it is contractionary.
- Federal funds rate
- The interest rate banks charge each other for overnight loans; the Fed targets it via open-market operations.
- Expansionary monetary policy
- Increase the money supply (buy bonds) → interest rate down → investment up → AD shifts right.
- Contractionary monetary policy
- Decrease the money supply (sell bonds) → interest rate up → investment down → AD shifts left.
- Liquidity
- How easily an asset can be converted to cash without losing value; currency is the most liquid.
- The central bank (Federal Reserve)
- The institution that controls the money supply, sets monetary policy, and acts as lender of last resort.
- Reserve requirement as a tool
- Lowering it lets banks lend more (expansionary); raising it reduces lending (contractionary).
- Demand for money (transaction + asset)
- People hold money to make transactions and as an asset; higher interest rates reduce money holdings.
- Nominal interest rate
- The stated interest rate, set in the money market; it is not adjusted for inflation.
- Bond price and interest rate
- Bond prices and interest rates move inversely: when bond prices rise, yields (interest rates) fall.
- Money creation example
- With a 10% reserve ratio, $1,000 in new reserves can support up to $10,000 in new deposits (multiplier = 10).
- Short-run Phillips curve (SRPC)
- Downward-sloping: shows the short-run trade-off between inflation and unemployment.
- Long-run Phillips curve (LRPC)
- Vertical at the natural rate of unemployment; there is no long-run inflation–unemployment trade-off.
- Movement along the SRPC
- A rightward AD shift moves the economy up the SRPC (lower unemployment, higher inflation); a leftward shift moves it down.
- SRPC shifters
- Changes in expected inflation and supply shocks shift the short-run Phillips curve.
- AD-AS and Phillips curve link
- A rightward AD shift = lower unemployment + higher inflation = up the SRPC; the two models tell the same story.
- Loanable funds market
- The market where saving (supply) and investment demand set the real interest rate.
- Supply of loanable funds
- National saving (private + public); it slopes upward in the real interest rate.
- Demand for loanable funds
- Borrowing for investment; it slopes downward in the real interest rate.
- Crowding-out effect
- Government deficit borrowing raises demand for loanable funds, pushing up the real interest rate and reducing private investment.
- Real interest rate (loanable funds)
- Set where the supply of and demand for loanable funds intersect; it adjusts saving and investment.
- Government budget deficit
- When government spending exceeds tax revenue in a year; financed by borrowing, which can crowd out investment.
- Government budget surplus
- When tax revenue exceeds government spending; it adds to national saving (loanable funds supply).
- Long-run economic growth
- An increase in potential output, shown as a rightward shift of LRAS and an outward shift of the PPC.
- Sources of economic growth
- More physical and human capital, a larger labor force, better technology, and higher productivity.
- Productivity
- Output per worker (or per hour); rising productivity is a key driver of long-run growth and living standards.
- Human capital
- The knowledge, skills, and health of workers; investing in education raises productivity and growth.
- Physical capital
- Tools, machinery, and infrastructure used in production; more capital per worker raises output.
- Money growth and inflation (long run)
- Sustained money supply growth beyond real output growth causes inflation, not higher real output.
- Quantity theory of money
- MV = PQ; with stable velocity, growth in the money supply (M) feeds into the price level (P) in the long run.
- Why LRAS is vertical
- In the long run, output is set by resources and technology, not the price level — so stimulus only raises prices.
- Policy lags
- Recognition, decision (implementation), and impact lags can make stabilization policy mistimed.
- Expected inflation effect
- When workers and firms expect higher inflation, the short-run Phillips curve and SRAS shift, embedding the inflation.
- National saving
- Private saving plus public saving (the government surplus); the source of the supply of loanable funds.
- Investment and growth
- Higher investment in capital increases future productive capacity, shifting LRAS right over time.
- Deficit and the real interest rate
- A larger deficit increases loanable-funds demand, raising the real interest rate (crowding out investment).
- Net exports (NX)
- Exports minus imports; a component of aggregate demand in an open economy.
- Balance of payments
- A record of all transactions between a country and the rest of the world: current account + financial (capital) account.
- Current account
- The part of the balance of payments tracking exports and imports of goods/services plus income flows.
- Financial (capital) account
- The part of the balance of payments tracking flows of financial assets and investment between countries.
- Trade deficit
- When a country imports more than it exports (negative net exports / current-account deficit).
- Trade surplus
- When a country exports more than it imports (positive net exports / current-account surplus).
- Foreign exchange market
- The market where currencies are traded; supply and demand set each exchange rate.
- Appreciation
- A rise in a currency's value relative to another; imports become cheaper and exports more expensive.
- Depreciation
- A fall in a currency's value relative to another; exports become cheaper and imports more expensive.
- Interest rates and exchange rates
- Higher domestic real interest rates attract foreign capital, raising demand for the currency, which appreciates.
- Exchange rate and net exports
- A stronger (appreciated) currency raises export prices abroad and lowers import prices, tending to reduce net exports.
- Demand for a currency
- Comes from foreigners buying the country's exports and investing in its assets; more demand → appreciation.
- Supply of a currency
- Comes from domestic residents buying foreign goods/assets; more supply → depreciation.
- Current account vs financial account
- They tend to offset: a current-account deficit is matched by a financial-account surplus (capital inflow).
- Floating exchange rate
- An exchange rate determined by market supply and demand rather than fixed by the government.
- Net capital inflow
- When foreign purchases of domestic assets exceed domestic purchases of foreign assets; finances a trade deficit.
- Tariffs and trade
- Taxes on imports that raise their price, reducing imports; they protect domestic producers but can reduce overall gains from trade.
- Real GDP growth rate
- The percent change in real GDP from one period to the next; a key measure of economic expansion.
- Value added
- The market value a firm adds at each stage of production; summing value added avoids double-counting in GDP.
- Transfer payments
- Government payments (Social Security, unemployment) for which no good or service is produced; excluded from GDP.
- Underground economy
- Unreported transactions (illegal or off-the-books) that are not counted in official GDP.
- Standard of living
- Often measured by real GDP per capita; long-run growth raises it.
- Velocity of money
- The average number of times a dollar is spent on final goods in a year; V in MV = PQ.
- Fiscal policy
- Government use of spending and taxes to influence aggregate demand and the economy.
- Expansionary vs contractionary policy
- Expansionary boosts AD (fights recession); contractionary reduces AD (fights inflation).
- Wealth effect
- A lower price level raises the real value of money holdings, increasing consumption — a reason AD slopes down.
- Interest-rate effect
- A lower price level lowers interest rates, raising investment — a reason AD slopes down.
- Net-exports (foreign-purchases) effect
- A lower domestic price level makes exports cheaper and imports dearer, raising net exports — a reason AD slopes down.
- Reserves
- Funds banks hold as vault cash or deposits at the central bank, not lent out.
- Lender of last resort
- The central bank's role of lending to banks in a financial crisis to prevent collapse.
- Quantitative easing
- Large-scale central-bank purchases of assets to expand the money supply when interest rates are near zero.
- Money neutrality (long run)
- In the long run, a change in the money supply affects only the price level, not real output.
- Demand-pull vs cost-push (graphs)
- Demand-pull = rightward AD shift; cost-push = leftward SRAS shift. Both raise the price level.
- Potential output (potential GDP)
- The real GDP an economy produces at full employment; LRAS sits here.
- Output gap
- The difference between actual real GDP and potential GDP; positive = inflationary, negative = recessionary.
- Sticky wages and SRAS
- Because nominal wages adjust slowly, a higher price level raises profits and output short-run, giving SRAS its upward slope.
- Disposable income
- Income after taxes; households divide it between consumption and saving (MPC + MPS = 1).
- Saving and investment identity
- In a closed economy, national saving equals investment; saving funds the loanable-funds supply.
- Public saving
- The government's budget balance (T − G); a surplus adds to national saving, a deficit subtracts.
- Private saving
- Household and business saving out of disposable income; part of the loanable-funds supply.
- Rational expectations
- The idea that people use all available information to anticipate policy, which can blunt its short-run effects.
- Demand for loanable funds shifters
- Changes in investment demand and government borrowing (deficits) shift the demand for loanable funds.
- Supply of loanable funds shifters
- Changes in private saving, public saving, and capital inflows shift the supply of loanable funds.
- Net exports and AD
- Rising net exports shift AD right; falling net exports shift AD left.
- Comparative advantage and trade gains
- Countries gain by exporting goods of low opportunity cost and importing goods of high opportunity cost.
- Capital inflow and the dollar
- Foreign investment in U.S. assets raises demand for dollars, causing the dollar to appreciate.
- Exports
- Goods and services produced domestically and sold abroad; they add to net exports and GDP.
- Imports
- Goods and services produced abroad and bought domestically; they subtract from net exports.
- Real vs nominal exchange rate
- The nominal rate is the price of one currency in another; the real rate adjusts for price levels in both countries.
- Effect of inflation on exchange rate
- Higher domestic inflation makes exports less competitive, reducing demand for the currency and causing depreciation.
- Monetary policy and exchange rates
- Expansionary monetary policy lowers interest rates, reducing currency demand and tending to depreciate it.
- Fiscal policy and crowding out
- Deficit-financed spending can raise interest rates and reduce private investment, offsetting some of its effect.
- Adaptive expectations
- People form inflation expectations based on past inflation; this can shift the short-run Phillips curve over time.
- Demand-side vs supply-side policy
- Demand-side policy shifts AD; supply-side policy (e.g., investment incentives) aims to shift SRAS/LRAS right.
- GDP gap and unemployment (Okun)
- A negative output gap is associated with cyclical unemployment above the natural rate.
- Nominal vs real wages
- Nominal wages are in current dollars; real wages adjust for inflation and reflect purchasing power.
- Aggregate expenditures
- Total planned spending in the economy: C + I + G + NX, the basis of aggregate demand.