Investment and Saving in Globalized Financial Markets

Investment and Saving in Globalized Financial Markets

Introduction

This section explores how the equilibrium interest rate is determined in the market for financial capital in a global context. It examines the supply of saving and the demand for investment, both locally and internationally, and discusses the implications of open versus closed economies. The analysis is essential for understanding how financial markets operate in a globalized world and how domestic and international factors influence interest rates and capital flows.

The Law of One Price in a Globalized Financial Market

Key Assumptions and Model Structure

The law of one price states that in a globalized financial market, the same type of financial capital should have the same price (interest rate) everywhere, assuming no barriers to capital mobility. The model is built on several key assumptions:

• Quantity of Financial Capital Demanded: Negatively related to the real interest rate. As interest rates rise, the demand for investment funds falls.

• Quantity of Financial Capital Supplied: Positively related to the real interest rate. Higher interest rates incentivize more saving.

• Single Type of Financial Capital: The model assumes a single, homogenous type of financial capital in the country and globally.

• Highly Mobile Capital: Financial capital can move freely across borders in response to differences in returns.

• Free Trade in Financial Assets: There are no restrictions on the international movement of financial capital.

Example: If the real interest rate is higher in Canada than in the rest of the world, capital will flow into Canada until the rates equalize.

Graphical Representation

The model uses supply and demand curves for financial capital to determine the equilibrium interest rate. In a closed economy, the intersection of the domestic supply and demand curves determines the interest rate. In an open economy, the world interest rate prevails, and capital flows adjust to equalize rates across countries.

Table: Comparison of Closed vs. Open Financial Markets

Feature	Closed Economy	Open Economy
Interest Rate Determination	Domestic supply and demand	World supply and demand
Capital Mobility	Immobile	Highly mobile
Capital Flows	None	Inflow or outflow to equalize rates

Investment–Saving Imbalances Within a Country

Capital Flows and Interest Rate Adjustments

When a country's supply of savings does not match its demand for investment at the world interest rate, capital flows occur to restore equilibrium. The following scenarios can arise:

• Excess Demand for Financial Capital: If domestic investment demand exceeds domestic saving supply at the world interest rate, the country will import capital (capital inflow) to finance the excess investment. This results in a current account deficit.

• Excess Supply of Financial Capital: If domestic saving supply exceeds investment demand at the world interest rate, the country will export capital (capital outflow), leading to a current account surplus.

Example: If Canada’s saving supply is greater than its investment demand at the world interest rate, Canada will lend the surplus abroad, resulting in a capital outflow and a current account surplus.

Table: Investment–Saving Imbalances and Capital Flows

Scenario	Capital Flow	Current Account Effect
Excess Investment Demand	Capital inflow	Current account deficit
Excess Saving Supply	Capital outflow	Current account surplus

Domestic Shocks

Impact of Shocks on Financial Markets

Domestic shocks, such as changes in investment demand or saving supply, can affect a country's financial market equilibrium. In an open economy, these shocks lead to capital flows that help maintain the world interest rate:

• Increase in Investment Demand: Leads to higher capital inflow and a larger current account deficit.

• Increase in Saving Supply: Results in greater capital outflow and a larger current account surplus.

Example: If Canadian households decide to save more, the increased supply of financial capital will be lent abroad, increasing Canada’s current account surplus.

Key Formulas and Equations

• Equilibrium in the Financial Market (Closed Economy):

$S = I$

• Net Capital Outflow (Open Economy):

$NCO = S - I$

• Current Account Balance:

$CA = NCO$

Where: S = national saving, I = investment, NCO = net capital outflow, CA = current account balance.

Summary

• Globalized financial markets link domestic saving and investment to the world market.

• Interest rates are determined by global supply and demand for financial capital.

• Capital flows adjust to imbalances between domestic saving and investment, affecting the current account.

• Domestic shocks can lead to changes in capital flows and current account balances.