Absolute and Comparative Advantage in International Trade

Absolute Advantage

• Definition 1: A person or country has an absolute advantage if they can produce more of a good than another person or country, using the same or a fixed amount of inputs.

• Definition 2: A person or country has an absolute advantage if they can produce a fixed amount of output (the same output) using fewer inputs than another person or country.

• Example: Ruby having an absolute advantage in all goods means she can produce more of every good than Frank with the same resources.

• It is possible for a person or country to have an absolute advantage in all goods, as demonstrated with Ruby.

Comparative Advantage Principle

• A person or country cannot have a competitive (comparative) advantage in all goods. This is mathematically impossible.

• Core Principle: If a person or country has a comparative advantage in one good, the other person or country will necessarily have a comparative advantage in the other good.

• This principle arises from the relationship between opportunity costs:

  • The opportunity cost of one good for a given person or country is the inverse reciprocal of the opportunity cost of the other good for that same person or country.

  • For Frank, the opportunity cost of meat is the inverse of his opportunity cost of potatoes.

  • For Ruby, the opportunity cost of potatoes is the inverse of her opportunity cost of meat.

Benefits of Trade and Specialization

• Increased Total Production: Global total production increases with free trade when countries specialize.

• Economic Pie Increases: With specialization and increased production, the overall economic pie becomes larger, meaning everyone can potentially have a bigger slice and be better off.

• Mechanism (Specialization):

  • Individuals and countries specialize in producing goods where they have a comparative advantage (what they do best).

  • Example: A professor's best skill is teaching, while car repair is not a specialty. Changing a tire might take the professor $3$ hours.

  • Instead of the professor spending $3$ hours changing a tire, a specialized mechanic can do it in $30$ minutes.

  • By letting the specialist handle car repairs, the professor saves $3$ hours, which can then be used to teach more efficiently, producing more education.

  • Similarly, the mechanic, who might take multiple classes to teach what the professor teaches in one, focuses on car repair where they are faster and more efficient.

  • This focus on competitive advantage saves resources (like time in this example) and allows for greater overall production of goods and services.

Conditions for Trade

• Voluntary Exchange: Trade is a voluntary issue. If one side does not agree to trade, it will not happen.

• Outcome without Trade: If trade doesn't happen, nobody is better off or worse off; all parties remain in the same state.

• Outcome with Trade: If trade happens (both sides agree), everyone is better off; everyone benefits from trade.

• Acceptable Price/Exchange Rate: For trade to occur, the agreed-upon price (or exchange rate) of the goods must be in between the two countries' or individuals' opportunity costs.

  • If the price falls outside this range, one side will not agree, and trade will not take place.

Application: US and Japan Trade Example

• Scenario Setup: The principles of trade are applied to two countries (The US and Japan) and two goods (airplanes and soybeans).

• Comparison: The analysis aims to compare production and consumption levels when each country is self-sufficient versus when they trade.

• Initial Data (Critique of Slides):

  • The transcript notes a section of the lecture slides as