Chapter 18 - Open-Economy Macroeconomics: Basic Concepts

Chapter 18 - Open-Economy Macroeconomics: Basic Concepts

Overview of Trade

  • Trade allows individuals and countries to specialize in the production of goods and services in which they have a comparative advantage.
  • The benefits of trade accrue to all participating countries, helping raise their living standards.

Key Concepts of an Open Economy

  • Open Economy: An economy that interacts freely with other economies around the world, facilitating trade and capital movements.
    • Interactions occur through:
    • Buying and selling goods and services in global product markets.
    • Trading capital assets such as stocks and bonds in global financial markets.

Exports and Imports

  • Exports: Goods and services produced domestically and sold to other countries.
  • Imports: Goods and services produced abroad and sold domestically.
  • Net Exports (NX): The value derived from the difference between exports and imports. Also referred to as trade balance.
    • Formula: NX=extExports−extImportsNX = ext{Exports} - ext{Imports}

Trade Balance Classifications

  • Trade Surplus: Occurs when exports exceed imports (NX > 0). A country sells more goods than it buys from abroad.
  • Trade Deficit: Arises when imports exceed exports (NX < 0). A country buys more goods from abroad than it sells.
  • Trade Balance: Represents a situation where exports equal imports (NX = 0).

Example Scenarios Affecting Net Exports

  1. An American art professor touring museums in Europe negatively impacts U.S. exports as this counts as an import.
  2. Students in Paris viewing a Hollywood movie positively contributes to U.S. exports.
  3. Purchasing a new Volvo by your uncle counts as a U.S. import.
  4. A Canadian shopping in Vermont counts as an export for the U.S.

Financial Capital Flows

  • Net Capital Outflow (NCO): The difference between the purchase of foreign assets by domestic residents and the purchase of domestic assets by foreigners.
    • Formula:
      NCO=extPurchaseofforeignassetsbydomesticresidents−extPurchaseofdomesticassetsbyforeignersNCO = ext{Purchase of foreign assets by domestic residents} - ext{Purchase of domestic assets by foreigners}

Capital Flow Types

  • Foreign Direct Investment (FDI): Represents investment by a domestic entity in foreign assets; for example, a U.S. company opening a restaurant abroad.
  • Foreign Portfolio Investment (FPI): Refers to purchasing stocks or bonds in another country; for instance, an American buying stock in a foreign corporation.

NCO Characteristics

  • Positive NCO: Domestic residents are purchasing more foreign assets than foreigners are buying of domestic assets. Capital is flowing out of the country.
  • Negative NCO: Domestic residents are purchasing less foreign assets than foreigners are accumulating of domestic assets. Capital is flowing into the country.

Examples of Net Capital Outflow Transactions

  1. An American cellular phone company sets up an office in the Czech Republic (FDI).
  2. Harrods selling stock to GE pension fund (FPI).
  3. Honda expanding its factory in Ohio (FDI).
  4. A mutual fund selling its Volkswagen stock to a French individual (FPI).

Relationship Between NCO and NX

  • The identity NCO=NXNCO = NX holds true, meaning that any activity affecting net exports will also affect net capital outflow equivalently.
    • Example: A programmer selling software to a Japanese consumer for 10,000 yen increases U.S. net exports.
    • Use case scenarios lead to various outcomes based on what you do with the yen:
      • Storing yen means acquiring a foreign asset (increasing NCO).
      • Purchasing foreign stocks or bonds with yen also increases NCO.
      • Buying imported goods with yen keeps NX unchanged.

National Savings and Investment in Open Economies

  • Total national income (Y) in an open economy can be represented as: Y=C+I+G+NXY = C + I + G + NX where:
    • CC = Consumption
    • II = Investment
    • GG = Government Spending
    • NXNX = Net Exports
  • National savings (S) is expressed as:
    S=Y−C−GS = Y - C - G
  • Therefore, in an open economy: S=I+NXS = I + NX
    • Since NX=NCONX = NCO, it can further be expressed as:
      S=I+NCOS = I + NCO

Example Calculation

  • Given specific equations:
    • Y=C+I+G+NXY = C + I + G + NX
    • Y=6000Y = 6000
    • G=1100G = 1100
    • T=1200T = 1200
    • C=250+0.7(Y−T)C = 250 + 0.7(Y - T)
    • I=1100−55rI = 1100 - 55r
    • NX=965−965hetaNX = 965 - 965 heta
    • Find savings, investment, and trade balance values.

Exchange Rates in International Trade

  • Nominal Exchange Rate: The value at which one currency can be exchanged for another (for example, 80 yen for 1 dollar).
  • Appreciation: Occurs when the exchange rate allows 1 dollar to buy more of a foreign currency (e.g., from 80 to 90 yen).
  • Depreciation: Happens when the dollar buys less foreign currency (e.g., falling from 80 to 70 yen).

Implications of Dollar Appreciation

  • Various economic participants may be happy or unhappy with an appreciating dollar:
    • Dutch pension funds: Likely happy as the value of U.S. bonds rises.
    • U.S. manufacturing industries: Unhappy as exports become more expensive abroad.
    • Australian tourists: Happy due to lower costs for travel.
    • American firms buying overseas: Unhappy as foreign properties become more expensive.

Real Exchange Rate Definition

  • The real exchange rate measures how many goods and services one country can trade for those from another.
  • Given by the formula:
    extRealExchangeRate=extNominalExchangeRateimesextDomesticPriceextForeignPriceext{Real Exchange Rate} = ext{Nominal Exchange Rate} imes \frac{ ext{Domestic Price}}{ ext{Foreign Price}}

Real Exchange Rate Example

  • If American rice is priced at $100 and Japanese rice at 16,000 yen with a nominal exchange rate of 80 yen per dollar, calculate the real exchange rate.

Calculating Real Exchange Rate

a. If a bushel of rice in the US sells for $100 (1 dollar = 80 yen) and in Japan for 16,000 yen, the real exchange rate calculation steps.

Overall Real Exchange Rate Calculation

  • A comprehensive formula to compute the real exchange rate: extRealexchangerate=eimesPP∗ext{Real exchange rate} = e imes \frac{P}{P^*} where:
    • PP = U.S. price index
    • P∗P^* = Foreign price index

Situational Analysis of Real Exchange Rate

  1. Prices in the U.S. rise faster than abroad but nominal exchange rate remains steady.
  2. U.S. prices rise slower than abroad with constant nominal exchange rate.
  3. Nominal exchange rate declines with unchanged prices.
  4. Nominal exchange rate declines with faster price increases abroad.

Purchasing-Power Parity (PPP)

  • Purchasing-power parity: A theory proposing that a unit of currency should have the same purchasing power across different nations, aligned with the law of one price.
    • This is contingent on price differences being rectified through arbitrage.
    • Exchange rate dependency on relative price levels must be equalized.

Equation Derivation Using PPP

  1. Under stable purchasing power:
    1P=eP∗\frac{1}{P} = \frac{e}{P^*}
  2. Rearranging gives:
    1=ePP∗1 = e \frac{P}{P^*}
  3. The nominal exchange rate relies on both price levels and money supply.

Example with Real Goods

  • Cost of soda in the U.S. at $1.25 versus 25 pesos in Mexico provides clarity on nominal exchange rate assumptions.
    • Evaluate the exchange rate if prices double in Mexico.

Limitations of Purchasing-Power Parity

  • PPP is not fully reliable due to:
    • Non-tradable goods like haircuts that lack price uniformity.
    • Tradeable commodities varying in substitution quality across different nations.
    • Real exchange rates can fluctuate for these reasons.

Note: The document captures critical concepts relating to open-economy macroeconomics, including trade, net exports, net capital outflow, and exchange rates, along with detailed examples and formulas. All terms and scenarios are fully elaborated to ensure a comprehensive understanding.