Comparative Advantage and the Gains From Trade

Vocabulary flashcards covering core concepts of comparative advantage, production possibilities frontiers, opportunity costs, and gains from trade from Economics 101.

Production Possibilities Frontier (PPF)

A model used to illustrate scarcity, trade-offs, and opportunity costs by showing the maximum combinations of two goods an economy or individual can produce.

Attainable and Unattainable Regions

On a Production Possibilities Frontier, combinations of goods on or inside the curve represent attainable production choices, whereas points lying strictly outside the line are unattainable given current resources.

Absolute Advantage

The ability of an individual or country to produce more of a good or service using the same amount of resources compared to another producer.

Comparative Advantage

The ability of an individual or country to perform an activity or produce a good at a lower opportunity cost than anyone else.

Constant Opportunity Cost

A condition where the opportunity cost of producing an additional unit of a good remains unchanged as production varies, represented graphically by a linear (straight-line) PPF.

Increasing Opportunity Cost

A condition where producing additional units of a good requires relinquishing progressively larger amounts of another good, represented graphically by a bowed-out (concave) PPF.

Snicker Bars and Twizzlers Opportunity Cost Example

In a linear PPF with maximum outputs of $10\,\text{Snicker Bars}$ and $5\,\text{Twizzlers}$, the opportunity cost of $1\,\text{Twizzler}$ is $\frac{10}{5} = 2\,\text{Snickers}$, while the opportunity cost of $1\,\text{Snicker}$ is $\frac{5}{10} = 0.5\,\text{Twizzlers}$.

Opportunity Cost Table (Matt and Kate Example 1)

A summary showing Matt's opportunity cost for $1\,\text{Cloth}$ is $0.2\,\text{Corn}$ (giving Matt comparative advantage in Cloth), and Kate's opportunity cost for $1\,\text{Corn}$ is $2\,\text{Cloth}$ (giving Kate comparative advantage in Corn).

Gains from Trade

The economic benefit realized when individuals or countries specialize in producing goods where they hold a comparative advantage, enabling both trading parties to consume combinations outside their individual PPFs.

Trade Ratio Rule of Thumb

The requirement that for trade to be mutually beneficial, the agreed trade ratio must lie strictly between the opportunity costs of both trading parties ($\text{Party A OC} < \text{Trade Ratio} < \text{Trade Party B OC}$).

China Shock

An empirical phenomenon documented by Autor, Dorn, and Hanson illustrating the impact of increased trade competition from China on U.S. manufacturing wage and salary employment between $2002$ and $2018$.

Short-Run vs. Long-Run Trade Impacts

In the short run, trade redistributes gains unevenly, causing job losses in import-competing sectors; in the long run, trade leads to higher total output, productivity, and overall standard of living.