International Capital Flows and Exchange Rates

Overview of the Foreign Exchange Market (Forex)

The foreign exchange market, commonly referred to as Forex, is the specific market where individuals, firms, and governments use one currency to purchase another currency. It represents the largest and most liquid market in the global economy.

• Market Scale (2022 Data):     * Daily Trading Volume: Approximately $\$7.5 \text{ trillion}$.     * Comparative Context: For the same year, the U.S. real GDP was approximately $\$25.4 \text{ trillion}$ per year. The daily trade in Forex is nearly a third of the entire annual U.S. GDP.

• Market Participants:     1. International Firms/Corporations: These entities demand foreign currency to pay international costs (such as payroll for workers stationed abroad) and supply foreign currency when they need to convert sales revenue earned in foreign markets back into their home currency.     2. Tourists: While a visible part of the market, they are considered "not very important" in terms of total volume.     3. International Investors: These participants trade currencies to facilitate cross-border investments.

International Financial Investment and Speculation

International investment is a primary driver of Forex market activity. These investments are categorized into two main types:

• Foreign Direct Investment (FDI): This involves purchasing at least $10\%$ of a firm or starting a new enterprise in a foreign country. It implies a degree of management responsibility and a long-term commitment.
• Portfolio Investment: These are purely financial investments that do not involve management responsibility.     * Examples include a U.S. investor purchasing U.K. government bonds or buying less than $10\%$ of a business's stock.     * Speculative Portfolio Investments: Most transactions in the Forex market fall into this category. It involves "betting" on the future movement of exchange rates to generate a profit.

Mechanics of Speculative Exchange Rate Trading

Investors manage their portfolios based on expectations of currency value changes:

• Expected Appreciation (Strengthening):     * Scenario: Today's rate is $\$1$ per euro ($\$1/€1$). An investor expects the rate to hit $\$1.10$ per euro next month.     * Action: Buy $100$ euros today for $\$100$.     * Result: Sell those $100$ euros next month for $\$110$, resulting in a $\$10$ profit.
• Expected Depreciation (Weakening):     * Scenario: Today's rate is $\$1$ per euro. An investor expects the rate to drop to $\$0.90$ per euro next month.     * Action: Borrow $90$ euros today and convert them to $\$90$.     * Result: Use that $\$90$ next month to buy back $100$ euros, repay the debt, and keep a profit of $10$ euros.

Implication: Expectations regarding the future value of a currency can drive current demand and supply in the foreign exchange market.

Strengthening and Weakening Currencies

The value of a currency is always relative to another.

• Appreciating (Strengthening): An increase in the value of a currency relative to others.     * Example: A shift from $\$1 = €1$ to $\$1 = €1.10$ means the U.S. dollar has appreciated. One dollar now buys more euros, making the dollar more valuable. Consequently, the euro has depreciated relative to the dollar.
• Depreciating (Weakening): A decrease in the value of a currency relative to others.     * Example: A shift from $\$1 = €1$ to $\$1 = €0.90$ means the U.S. dollar has depreciated. One dollar now buys fewer euros. In this scenario, the euro has appreciated relative to the dollar.

Microeconomic and Sectoral Impacts of Currency Fluctuations

Changes in currency value create "winners" and "losers" across different economic sectors.

Impact on Foreign Investment

• Scenario: An investor holds $1,000\,CAD$ in a Canadian tech company when the exchange rate is $1\,USD = 1\,CAD$. The investment is worth $\$1,000\,USD$.
• Change: The USD strengthens to $1\,USD = 2\,CAD$.
• Result: The $1,000\,CAD$ investment can now only be exchanged for $\$500\,USD$. The investor loses value (Investment value drops by half).

Impact on Imports

• Scenario: A consumer wants to import Canadian maple syrup costing $10\,CAD$. At $1\,USD = 1\,CAD$, the cost is $\$10\,USD$.
• Change: The USD strengthens to $1\,USD = 2\,CAD$.
• Result: The consumer can buy the required $10\,CAD$ for only $\$5\,USD$. Imports become cheaper for the domestic consumer.

Impact on Exports

• Scenario: Apple exports MacBooks to Canada at a cost of $\$1,000\,USD$ each. At $1\,USD = 1\,CAD$, the laptop costs $1,000\,CAD$ for the Canadian buyer.
• Change: The USD strengthens to $1\,USD = 2\,CAD$.
• Result: The buyer now needs $2,000\,CAD$ to purchase the $\$1,000\,USD$ required for the MacBook. Exports become more expensive for foreign buyers, leading to fewer sales and a negative impact on the exporting firm.

Summary of Outcomes

• Stronger Currency: Exports become more expensive; imports become less expensive. Beneficial for domestic consumers of imports.
• Weaker Currency: Exports become less expensive; imports become more expensive. Can spur exports and domestic economic growth.

Supply and Demand in the Forex Market

The exchange rate is ultimately a price—the price of one currency in units of another. Just like goods and services, currencies are traded based on supply and demand.

• Measurement: The exchange rate can be viewed from either perspective. The peso/dollar exchange rate is the inverse of the dollar/peso exchange rate.     * Logic: $\frac{1}{0.1} = 10$
• Market Behavior:     * A higher exchange rate (price) leads to a higher quantity supplied of that currency.     * A higher exchange rate leads to a lower quantity demanded of that currency.

Determinants of Exchange Rate Shifts

Three primary factors shift the supply and demand curves in the Forex market:

1. Expectations about Future Exchange Rates:     * If people believe the dollar will strengthen against the peso, demand for dollars increases and supply of dollars decreases. This causes an immediate appreciation of the dollar.
2. Cross-Country Differences in Rates of Return:     * Investors seek high returns (e.g., higher interest rates). If a country's rate of return is relatively high, it attracts foreign funds.     * An increase in the expected rate of return for the U.S. dollar increases demand for dollars and decreases supply, causing the dollar to appreciate.
3. Relative Inflation:     * High inflation relative to other economies erodes the buying power of a currency, discouraging people from holding it.     * Increased expected inflation in the U.S. (relative to Mexico) results in decreased demand for dollars and increased supply of dollars, leading to immediate depreciation.

Macroeconomic Effects of Exchange Rates

Governments and central banks monitor exchange rates for several critical reasons:

• Long-Run Aggregate Demand (AD):     * Strong Currency: Decreases exports and increases imports, leading to lower Aggregate Demand.     * Weak Currency: Increases exports and decreases imports, leading to higher Aggregate Demand.
• Short-Run Stability:     * Large fluctuations can create an unstable business climate.     * Banking Sector Vulnerability: Many banks borrow internationally in major currencies like US dollars, Japanese yen, or euros. A sudden depreciation of their home currency makes it much harder to repay these international debts.

Exchange Rate Policies

There are four primary policy frameworks for managing currency values:

1. Floating Exchange Rates: The value is determined completely by market forces. The U.S. dollar and approximately $40\%$ of world currencies use this system. The main concern is extreme volatility in short periods.
2. Soft Exchange Rate Pegs: The market usually determines the rate, but the central bank intervenes if the rate moves too rapidly in one direction. Examples include Costa Rica, Vietnam, and Nicaragua.
3. Hard Exchange Rate Pegs: The central bank sets a fixed, unchanging value for the currency. Examples include Belize, Jordan, and Saudi Arabia (which peg to the USD).
4. Merging Currencies: A nation adopts the currency of another nation. This eliminate foreign exchange risk but sacrifices control over domestic monetary policy.     * Dollarization: Countries using the U.S. dollar (e.g., Ecuador, Zimbabwe, Marshall Islands, Panama).     * Eurozone: A monetary union of $19$ countries using the Euro, controlled by the European Central Bank.

Mechanics and Tradeoffs of Pegging

How Central Banks Defend a Peg

• If the goal is to keep the currency value low (below equilibrium):     * Option 1: Expansionary monetary policy (lower interest rates) to decrease demand/increase supply.     * Option 2: The central bank buys foreign currencies (dollars) using their own currency to bridge the gap.
• If the goal is to keep the currency value high (above equilibrium):     * Option 1: Contractionary monetary policy (higher interest rates) to increase demand/lower supply.     * Option 2: The central bank buys its own currency using foreign reserves to bridge the gap.

Tradeoffs and Risks

• Reserve Exhaustion: Defending a peg requires foreign currency reserves, which can run out.
• Speculative Attacks: If investors believe a peg cannot hold, they may sell the currency en masse, causing huge capital outflows.
• Monetary Policy Limitations: When a currency is pegged, the money supply and interest rates must be used to maintain the exchange rate, meaning monetary policy can no longer focus solely on domestic unemployment or inflation.