Macroeconomics: Money Market, Policy, and Inflation Dynamics

Money Demand

Quantity of money people want to hold; depends negatively on interest rates and positively on income and price levels

Liquidity Preference Model

Interest rate determined by intersection of money supply (controlled by central bank) and money demand curve

Opportunity Cost of Holding Money

Interest forgone by holding cash instead of interest-bearing assets like CDs

Money Supply Curve

Vertical line controlled by central bank through open market operations

Money Demand Curve

Downward-sloping curve showing inverse relationship between interest rate and quantity of money demanded

Short-Run Effects of Money Supply Increase

Lowers interest rates, stimulates aggregate expenditure and output, increases inflation

Long-Run Effects of Money Supply Increase

Returns to natural output level; primary effect is higher prices (money neutrality)

Demand-Side Shifts in Money Market

Increases in income or prices shift money demand rightward, raising interest rates

Supply-Side Shifts in Money Market

Open market purchases increase money supply and lower rates; sales decrease supply and raise rates

Zero Lower Bound

Constraint on monetary policy; interest rates cannot fall significantly below zero

Federal Reserve

Central bank controlling money supply and interest rates to achieve macroeconomic goals

Open Market Operations

Fed's primary tool; buying/selling government securities to change money supply

Discount Window

Fed lending facility allowing banks to borrow directly at discount rate

Reserve Requirements

Percentage of deposits banks must hold; changes affect money supply

Target Federal Funds Rate

Interest rate the Fed aims to achieve through open market operations

Quantitative Easing

Unconventional policy; Fed purchases longer-term Treasury securities when rates hit zero lower bound

Fed Assets Expansion

Occurred dramatically during 2008 financial crisis and 2020 pandemic due to QE

Yield Curve

Relationship between interest rates and bond maturity; normally slopes upward

Inverted Yield Curve

Occurs during economic stress; short-term rates exceed long-term rates

Transmission Mechanism

How Fed policy affects real economy through interest rates, investment, and spending

Phillips Curve

Inverse relationship between unemployment and inflation identified by Phillips in 1958

Short-Run Phillips Curve

Downward-sloping curve showing trade-off between unemployment and inflation

Long-Run Phillips Curve

Vertical curve at NAIRU; shows no permanent trade-off between unemployment and inflation

NAIRU

Non-Accelerating Inflation Rate of Unemployment; natural rate of unemployment

Wage Adjustment

In long run, wages adjust upward, causing inflation to rise across all unemployment levels

Expansionary Policy Effect

Reduces unemployment while increasing inflation in short run

Hyperinflation

Monthly inflation exceeding 50%; results from money supply growth far exceeding output growth

Seigniorage

Revenue from printing money to finance government deficits; creates inflation tax

Germany 1923 Hyperinflation

Post-WWI hyperinflation caused by massive reparations, depressed tax base, and money printing

Vicious Cycle of Hyperinflation

Declining real money demand forces government to increase inflation to capture same tax revenue

Hyperinflation Cure

Requires central bank independence, tax-funded spending, currency reform, and access to foreign credit

Lack of Central Bank Autonomy

Key factor enabling hyperinflation; government controls money printing

Inflation Tax

Revenue equal to inflation rate times money supply; paid by those holding money

Classical Economics

Pre-Depression view: markets self-correct; aggregate supply vertical at potential output

Great Depression (1929-1933)

Dramatic decline in nominal GDP, investment, consumption; challenged classical theory

Keynesian Economics

Attributes business cycle to leftward shifts in aggregate demand; supports policy activism

Keynesian Explanation of Depression

Leftward AD shift with sticky prices caused lower output and inflation

Liquidity Trap

Problem where money demand becomes perfectly elastic at very low interest rates; monetary policy ineffective

Monetarism

Doctrine emphasizing monetary policy rule and steady money growth instead of discretionary policy

Quantity Theory of Money

M·V = P·Y; velocity relatively stable and independent of interest rates

Monetarist Explanation of Depression

Money supply fell significantly 1929-1933, causing collapse in nominal GDP

Crowding Out

Monetarist concern that government spending increases interest rates, reducing private investment

Velocity of Money

Ratio of nominal GDP to money supply; monetarists claim it's stable

Velocity Instability

Velocity has proven unstable over time, particularly during crises like 2020

Rational Expectations

Individuals and firms make decisions using all available information

New Classical Macroeconomics

Combines rational expectations with assumption that markets clear quickly

Sticky Prices

Prices adjust slowly to changes in demand; key to New Keynesian economics

Policy Activism

Government use of fiscal and monetary policy to stabilize economy

Policy Rule

Pre-announced, systematic approach to policy (vs. discretionary policy)

Ricardian Model

Trade based on labor productivity differences; countries export goods with comparative advantage

Specific-Factors Model

Accounts for non-constant opportunity costs; some factors specific to industries

Heckscher-Ohlin Model

Countries export goods intensive in their abundant factors of production

Comparative Advantage

Country can produce good at lower opportunity cost than trading partner

Absolute Advantage

Country can produce good using fewer resources than trading partner

Autarky

Self-sufficiency; domestic prices before international trade

World Price

Price of good in international market; determines import/export patterns

Gains from Trade

Both countries benefit by exporting goods using abundant factors, importing goods using scarce factors

Imports

Goods purchased from foreign countries when world price is lower than autarky price

Exports

Goods sold to foreign countries when world price exceeds autarky price

Consumer Surplus from Imports

Consumers benefit from cheaper imported goods

Producer Surplus from Exports

Producers benefit from higher export prices

Tariff

Tax on imported goods; raises domestic price, reduces imports, increases domestic production

Tariff Effects

Creates deadweight loss but generates government revenue

Tariff Rationales

Government revenue, national security, infant industry protection, job creation

Quota

Limit on quantity of imports; creates similar effects to tariffs

Protectionism

Government policies shielding domestic industries from foreign competition

WTO

World Trade Organization; multilateral agreement reducing tariffs and quotas

USMCA

United States-Mexico-Canada Agreement; regional trade agreement

EU

European Union; 27 members with four freedoms of movement and extensive standards harmonization

Trade Agreements Scope

Range from narrow focus on tariffs/quotas to broad regulatory harmonization

Deep Integration

Extensive standards harmonization on labor, environmental, and product standards

Balance of Payments

Accounts tracking country's international transactions

Current Account

Records exports/imports of goods and services, factor income, and unilateral transfers

Trade Balance

Exports minus imports of goods and services

Goods Trade Deficit

US goods trade deficit of $1.21 trillion in 2024

Services Trade Surplus

US services trade surplus of $310 billion in 2024

Current Account Deficit

US current account deficit of $1.18 trillion in 2024

Factor Receipts and Payments

Investment income and other factor income flows

Unilateral Transfers

International transfers like foreign aid and remittances

Capital Account

Records international transfers of non-financial assets like copyrights and patents

Financial Account

Records how countries finance current account deficits through asset sales and purchases

US Financial Account Deficit

$1.13 trillion in 2024; foreigners purchasing more US assets than Americans purchasing foreign assets

Current Account Deficit Financing

Financed by financial account surplus (foreign investment in US assets)

China Current Account

Shifted from deficits to substantial surpluses since 2005

EU Current Account

Moved toward surpluses in recent years

Oil-Exporting Nations

Experience high current account volatility tied to commodity price fluctuations

Savings and Investment

Current account patterns reflect differences in savings rates and investment levels

Foreign Exchange Market

Market where currencies trade at equilibrium exchange rates

Nominal Exchange Rate

Price of one currency in terms of another currency

Exchange Rate Appreciation

Currency becomes more valuable relative to other currencies

Exchange Rate Depreciation

Currency becomes less valuable relative to other currencies

Appreciation Effects

Makes exports more expensive and imports cheaper

Depreciation Effects

Makes exports cheaper and imports more expensive

Supply and Demand in FX Market

Currency supply and demand determine equilibrium exchange rate

Law of One Price

Same good should have same price in different countries (adjusted for exchange rates)

Purchasing Power Parity (PPP)

Exchange rate that equalizes price levels across countries

PPP Deviations

Actual exchange rates often deviate significantly from PPP in short to medium term

Fixed Exchange Rate

Government maintains constant rate through intervention, policy changes, or controls

Floating Exchange Rate

Exchange rate freely determined by market supply and demand

Managed Float

Government occasionally intervenes in floating rate system