Financial Markets, Savings, and Investment

Introduction

This study guide covers the core macroeconomic concepts related to financial markets, savings, investment, interest rates, and the role of government and the global economy. These topics are essential for understanding how resources are allocated in an economy and how policy decisions affect economic outcomes.

Big Concepts in Financial Markets

Key Topics

• Nominal and Real Interest Rate

• Consumption-Savings Decision faced by households

• Fisher Equation

• Determinants of Investment and Savings

• Government Sector (public saving, budget surplus/deficit)

• Crowding-out Effect

• Ricardo-Barro Effect

• Global Capital Flows

Investment and Capital

Definitions and Relationships

• Capital Stock: The total amount of plant, equipment, buildings, and inventories (physical capital) in the economy.

• Gross Investment: The purchase of new capital.

• Depreciation: The reduction in value of capital stock due to wear and tear.

• Net Investment: Net investment is the addition to the capital stock.

Capital vs. Financial Capital

• Capital: Physical assets used in production (tools, machines, buildings).

• Financial Capital: The funds firms use to purchase physical capital.

Wealth and Savings

Definitions

• Wealth: The value of all assets owned by individuals.

• Saving: Income not spent on consumption or taxes.

• Capital Gains: Increase in asset value.

• Capital Losses: Decrease in asset value.

Types of Savings

• Personal Saving: Disposable income minus consumption.

• Business Saving: Retained profits and pension fund additions.

• Government Saving: Budget surplus (taxes minus government purchases).

Decomposition of National Savings

Components

• National savings is the sum of personal, business, and government savings.

Practice Questions

• If national savings is $500B and private savings is $300B, what is public savings? Answer: $200B (since National = Private + Public)

• If national savings is $500B, business savings is $100B, and public savings is $300B, what is personal savings? Answer: $100B (since National = Personal + Business + Public)

The Savings Gap

Definition

• The savings gap is the difference between investment and national savings.

• A positive gap indicates investment exceeds national savings, often financed by borrowing from abroad.

Financial Capital Markets

Types of Markets

• Loan Markets

• Bond Markets

• Stock Markets

Financial Institutions

• Financial Institution: A firm that borrows in one market and lends in another.

• Examples: Commercial banks, mortgage lenders, pension funds, insurance companies, Federal Reserve.

Interest Rates

Nominal vs. Real Interest Rate

• Nominal Interest Rate: The percentage of the amount borrowed paid as interest, not adjusted for inflation.

• Real Interest Rate: The nominal rate adjusted for inflation.

• Opportunity Cost: The real interest rate represents the opportunity cost of borrowing.

The Fisher Equation and Fisher Effect

Fisher Equation

• Relates nominal and real interest rates: Ex ante: Ex post:

Fisher Effect

• An increase in expected inflation raises the nominal interest rate, leaving the expected real interest rate unchanged.

Market for Loanable Funds

Definition and Equation

• The market for loanable funds aggregates all financial markets.

• Funds for investment come from:

  1. Household and business savings ()

  2. Government budget surplus ()

  3. Borrowing from the rest of the world ()

• Equation:

Determinants

• The market determines:

  • Real interest rate

  • Quantity of funds loaned

  • Saving

  • Investment

Demand for Loanable Funds

• Depends on:

  1. Real interest rate

  2. Expected profit

• Business investment is the main source of demand.

• Demand curve: As real interest rate rises, quantity demanded falls.

Supply of Loanable Funds

• Depends on:

  1. Real interest rate

  2. Disposable income

  3. Expected future income

  4. Wealth

  5. Default risk

• Supply curve: As real interest rate rises, quantity supplied increases.

Equilibrium in the Loanable Funds Market

• Occurs when quantity demanded equals quantity supplied:

• Surplus of funds lowers the real interest rate; shortage raises it.

Government in the Loanable Funds Market (Closed Economy)

Role of Government

• Government saving is part of total saving.

• If net taxes () > government purchases (): Budget Surplus ()

• If net taxes () < government purchases (): Budget Deficit ()

Crowding-Out Effect

• A government budget deficit reduces national saving, raises the real interest rate, and decreases investment.

Ricardo-Barro Effect

• Households may increase private saving in response to a government deficit, offsetting the reduction in public saving.

Global Capital Flows (Open Economy)

World Interest Rate

• The real interest rate is determined globally, as capital moves across borders.

• Countries can borrow from or lend to the rest of the world.

Creditor vs. Debtor Nations

• Debtor Nation: Has borrowed more from the world than it has lent.

• Creditor Nation: Has lent more to the world than it has borrowed.

Twin Deficits Issue

• A large government budget deficit can lead to a trade deficit (net exports negative).

Summary Table: Types of Savings

Key Equations

• Net Investment:

• Real Interest Rate:

• Fisher Equation: (ex ante), (ex post)

• Loanable Funds Market:

• Government Saving:

Practice Application

• If the nominal interest rate is 6% and inflation is 4%, the real interest rate is:

Conclusion

Understanding the interaction between savings, investment, interest rates, and government policy is crucial for analyzing macroeconomic outcomes. The market for loanable funds provides a framework for examining how these factors determine the allocation of resources in both closed and open economies.