Trade

I. Trading Game

  • Trade increases aggregate utility.

  • Fundamental Theorem of Exchange: Voluntary trade with complete information is mutually beneficial.

    • Not necessarily equally beneficial.

    • Trade encourages peace and understanding.

  • Mistakes:

    • Small harms (e.g., bad movie).

    • People take extra care for big decisions (e.g., buying cars or houses).

II. Absolute Advantage

  • Nature of Wealth:

    • Jobs, gold, and money are proxies, not true wealth.

    • True measure: happiness.

  • Specialization: Under free trade, countries fully benefit from specialization.

  • Absolute Advantage: The ability to produce more of a good.

    • Example: Production possibilities for wine and chocolate:

CountryWine (barrels)Chocolate (pounds)

France

80

20

Germany

120

240

Switzerland

10

100

  • Germany has an absolute advantage in both wine and chocolate.

    • However, absolute advantage does not determine specialization.

III. Comparative Advantage

  • Opportunity Cost: Nations sacrifice production of one good to produce another.

    • Lowest opportunity cost = comparative advantage.

  • Calculating Comparative Advantage: Divide opportunity costs.

ProductCountryOpportunity Cost

Wine

France

0.25 pounds of chocolate

Germany

2.00 pounds of chocolate

Switzerland

10.00 pounds of chocolate

Chocolate

France

4.00 barrels of wine

Germany

0.50 barrels of wine

Switzerland

0.10 barrels of wine

  • France has the comparative advantage in wine (lowest opportunity cost).

  • Switzerland has the comparative advantage in chocolate.

IV. Trade Deficit

  • Formula: Exports – Imports = NX (Net Exports).

    • Trade Deficit: NX < 0 (Imports > Exports).

  • Misconceptions about Trade Deficits:

    1. Trade deficits also happen within countries.

    2. Imports increase utility (people get what they want).

    3. Trade deficit is only one part of the economy.

V. Balance of Payments (BoP)

  • Equation: NX + CA = 0

    • NX: Current account (flow of goods/services).

    • CA: Capital account (net flow of investment).

  • BoP Balances: NX and CA mirror each other, keeping BoP near zero.

  • Currency Use Abroad:

    1. Buy imports from the domestic country (NX increases).

    2. Invest in the domestic country (CA increases).

    3. Rarely: Circulate currency outside the domestic country.

  • Trade Deficit ≠ Debt:

    • It reflects flows of goods vs. investment, not financial debt.

  • GDP vs. Wealth: A fall in NX reduces GDP but doesn’t necessarily mean lower wealth.