Comprehensive Study Guide on Exchange Rates and Purchasing Power

Fundamentals of Exchange Rates and Purchasing Power

• Definition of Currency: Different nations utilize unique currencies for economic transactions. Notable examples include:

  • United States: U.S. dollar ($USD$).

  • China: Yuan ($CNY$ or $¥$).

  • European Union: Euro ($EUR$ or $€$).

• Necessity of Exchange: Foreigners wishing to purchase goods, services, or invest in assets within another country must typically pay using that country's specific currency. This requirement applies to individuals, private firms, commercial banks, and government entities.

• Foreign Exchange Market: This is the global decentralized market where currencies are traded for one another to facilitate international trade and investment.

• Exchange Rate Definition: The price at which one currency can be exchanged for another. It represents the ratio at which two items trade (e.g., the price of the euro expressed in terms of yuan).

The Foreign Exchange Model: U.S. Dollar and Japanese Yen Case Study

• Graphical Representation of the Yen Market:

  • Horizontal Axis: Represents the Quantity of foreign currency (in this case, trillions of Japanese yen per day). The scale ranges from $0$ to $160$ in increments of $10$.

  • Vertical Axis: Represents the Exchange Rate expressed as the price of one yen in terms of U.S. dollars ($USD/Yen$). The scale ranges from $0.004$ to $0.020$ in increments of $0.001$.

  • Demand Curve ($D$): Downward-sloping, indicating that as the price of yen falls, the quantity demanded increases.

  • Supply Curve ($S$): Upward-sloping, indicating that as the price of yen rises, the quantity supplied increases.

  • Equilibrium: The intersection occurs at a quantity of $90$ trillion yen per day and an exchange rate of $0.010 \text{ USD per yen}$.

Mechanics of Supply and Demand in Currency Markets

• Sources of Supply (Foreigners supplying their currency to get USD):

  • Foreign Consumers: Japanese tourists visiting the U.S. or Japanese entities purchasing American-made goods.

  • Foreign Investors: Those seeking to make financial investments in U.S. firms (stocks), government bonds, property, or acquiring ownership stakes in U.S. companies.

  • Mathematical Logic: The supply curve is upward-sloping because as the foreign currency appreciates (and the USD depreciates), U.S. goods and assets become relatively less expensive for foreigners. This incentivizes them to supply more of their own currency to acquire the dollars needed for these purchases.

• Sources of Demand (Domestic entities demanding foreign currency):

  • Domestic Consumers: U.S. citizens purchasing goods/services made in Japan or U.S. tourists visiting Japan.

  • Domestic Investors: U.S. entities making financial investments in Japanese firms or assets denominated in yen.

  • Mathematical Logic: The demand curve is downward-sloping because as foreign exchange appreciates, the price (in USD) of foreign assets and goods increases. Higher prices lead to a lower quantity demanded of foreign goods and, consequently, a lower quantity demanded of the foreign currency.

Consequences of Currency Appreciation and Depreciation

Impact of U.S. Dollar Appreciation (Stronger Dollar)

• Domestic Beneficiaries:

  • U.S. Importers and Consumers: It takes fewer dollars to buy foreign goods, making imports cheaper.

  • U.S. Tourists: Visiting foreign countries becomes less expensive as the dollar buys more foreign currency.

  • New Foreign Asset Investors: The effective price of foreign assets decreases.

• Domestic Groups Harmed:

  • U.S. Exporters: American products become more expensive for foreign buyers, leading to decreased demand and reduced profits.

  • Substantive Example - Existing Investors: U.S. investors already holding foreign assets are hurt because foreign returns (paid in foreign currency) exchange back into fewer U.S. dollars.

• Foreign Perspectives:

  • Harmed: Foreign consumers importing from the U.S. and tourists visiting the U.S. (reduced purchasing power).

  • Helped: Foreign firms exporting to the U.S. (products become cheaper for Americans, increasing demand) and foreign investors holding U.S. assets (returns paid in USD exchange for more of their local currency).

Impact of U.S. Dollar Depreciation (Weaker Dollar)

• Domestic Effects: Foreign goods become more expensive (hurting importers), but American exports become cheaper and more competitive abroad (helping domestic producers and the balance of trade).

International Trade and the Balance of Payments

• Balance of Trade (Net Exports): The difference between the monetary value of a country's exports and its imports.

  • Trade Surplus: When the value of exports exceeds the value of imports ($\text{Positive Balance of Trade}$).

  • Trade Deficit: When the value of imports exceeds the value of exports ($\text{Negative Balance of Trade}$).

• Exchange Rate Influence on Trade:

  • Appreciation: Leads to increased imports and decreased exports ($\text{Decreased Balance of Trade}$).

  • Depreciation: Leads to decreased imports and increased exports ($\text{Increased Balance of Trade}$).

• Balance of Payments ($BOP$): A broader measure of all economic transactions between a country and the rest of the world.

  • Credit: A transaction that brings money into a country.

  • Debit: A transaction that takes money out of a country (e.g., an American investing in an overseas company).

  • Components: Includes balance of trade, transfer payments, military spending, interest payments on loans, corporate dividends, and the buying/selling of currency.

Factors Shifting the Foreign Exchange Model

Fluctuations are driven by shifts in supply ($S$) and demand ($D$), which typically move in opposite directions.

1. Changes in Interest Rates

• Scenario: Domestic interest rates rise relative to foreign rates.

• Effect: Domestic and foreign investors seek higher returns in the domestic market.

• Action: Demand for domestic currency shifts right; supply of domestic currency shifts left.

• Result: The domestic currency appreciates.

• USD/CAD Example: If U.S. rates rise relative to Canada, demand for $USD$ increases and supply of $USD$ decreases, raising the $USD/CAD$ equilibrium rate.

2. Relative Rates of Inflation

• Scenario: Domestic inflation is higher than foreign inflation.

• Effect: Domestic goods become relatively more expensive than foreign goods.

• Action: Demand for foreign currency shifts right (to buy cheaper foreign goods); supply of foreign currency shifts left.

• Result: The domestic currency depreciates.

• USD/CAD Example: Higher U.S. inflation leads to a leftward shift in demand for $USD$ and a rightward shift in supply of $USD$, lowering the exchange rate.

3. Expectations of Future Exchange Rates

• Scenario: Market participants expect a currency to appreciate soon.

• Effect: Investors want to buy the currency now while it is relatively cheaper.

• Action: Demand shifts right; supply shifts left (holders keep the currency expecting it to be worth more later).

• Result: Current appreciation of the currency.

Managing Exchange Rates: Systems and Policies

Flexible (Floating) Exchange-Rate System

• Mechanism: Rates are determined solely by market supply and demand.

• Usage: Utilized by the U.S., the European Union, and most industrialized nations.

• Characteristics: Rates are constantly changing due to frequent shifts in interest rates, inflation, and expectations.

Fixed (Pegged) Exchange-Rate System

• Mechanism: The central bank intervenes to maintain a target exchange rate relative to another currency.

• Intervention Methods:

  • Open Market Operations: Buying or selling domestic currency for foreign currency to shift $D$ or $S$ curves.

  • Monetary Policy: Changing interest rates to attract or repel investment.

• Historical Example: China pegged the yuan to the U.S. dollar until $2005$.

• Advantages: Provides stability and reduces uncertainty for international trade contracts.

• Disadvantages:

  • Policy Conflict: Limits the ability to use monetary policy for domestic inflation or employment goals.

  • Reserve Cost: Requires holding massive foreign currency reserves.

  • Speculative Attacks: Occur when investors sell massive amounts of a currency to deplete the central bank's reserves, betting the bank will be forced to abandon the peg and allow the currency to depreciate.

Detailed Market Example: USD/MXN

• Model Structure:

  • Intersection: Equilibrium exchange rate ($E^*$) and quantity ($Q^*$).

  • Demand Logic: Holders of pesos demand dollars to buy U.S. goods. If the dollar depreciates ($USD/MXN$ falls), U.S. products are cheaper, incentivizing peso-holders to demand more dollars (Negative Slope).

  • Supply Logic: Holders of dollars supply them to buy pesos. If the dollar appreciates ($USD/MXN$ rises), peso-denominated items are cheaper, incentivizing dollar-holders to supply more dollars (Positive Slope).

Quantitative Conversion Example

• Given values: $12 \text{ euros}$ trade for $91.41 \text{ yuan}$.

• CNY/EUR Rate: Calculating the price of yuan in terms of euros:     $\frac{12€}{91.41¥} \approx 0.13 \text{ euros per yuan}$

• EUR/CNY Rate: Calculating the price of euros in terms of yuan:     $\frac{91.41¥}{12€} \approx 7.6175 \text{ yuan per euro}$ (Note: Transcript text provides approximately $7.5$ in text but calculated via $90/12$).