[3] Introduction to Economics I: Interdependence and the Gains from Trade

Vocabulary practice flashcards covering foundational concepts of interdependence, production possibility frontiers, absolute and comparative advantages, marginal rates of transformation, and the gains from trade.

Production Possibility Frontier (PPF)

A curve that shows the maximum amount of commodities a country can produce using all of its available resources.

Attainable vs. Unattainable Points (PPF)

Points located inside or on the boundary of the PPF (such as Point A) are possible to produce, though points strictly inside are inefficient. Points located outside the frontier (such as Point B) are impossible to produce with current resources.

Marginal Rate of Transformation (MRT)

The slope of the production possibility frontier, which quantifies the opportunity cost and trade-off between two commodities.

Terms of Trade

The relative price or rate of exchange at which two countries trade goods, measured in the model as the amount of wine exchanged for one fish.

Pre-War Terms of Trade Bounds

The range of acceptable exchange rates for fish and wine between NE and SE, which theoretically must fall between $2/3$ and $2$ bottles of wine per fish based on each empire's MRT.

Absolute Advantage

The ability of an economic entity or country to produce a larger total quantity of a good than another country using its resources.

Comparative Advantage

The ability of an economic entity to produce a good at a lower relative opportunity cost compared to another entity.

Opportunity Cost

The cost of producing an extra unit of one good expressed in the quantity of the alternative good that must be sacrificed (for instance, NE giving up $2/3$ bottle of wine per fish, while SE gives up $2$ bottles of wine per fish).

Specialization

The concentration of productive effort on specific tasks or goods in which an economy excels, driving higher overall productivity and requiring trade and money to obtain other goods.

Ideal Point (Balanced Diet Assumption)

The consumption bundle chosen by inhabitants who prefer balanced consumption, assumed to be the midpoint of a linear PPF (e.g., $(18, 12)$ for NE and $(9, 18)$ for SE prior to the war).

Gains from Trade

The net economic benefits realized when countries specialize and exchange goods, allowing both to consume beyond their domestic PPFs (such as NE and SE both reaching consumption bundles of $(18, 18)$).

Parallel Shift of the PPF

A proportional outward or inward displacement of the production frontier (such as after a war) that alters total productive capacity without changing the slope or marginal rate of transformation.

Partial Specialization

A situation where an economy does not allocate all of its resources to producing a single good due to trade constraints set by partner demand, as shown by NE producing $(39, 6)$ instead of completely producing only fish.

David Ricardo (1772–1823)

The English economist who introduced the concept of comparative advantage, demonstrating that trade and specialization remain mutually beneficial even when one trading partner has an absolute advantage in all goods.

Limitations of Specialization

Potential systemic downsides of trade specialization, including shifts in income distribution over time, increased economic vulnerability, risk of exploitation, and hurdles in modernizing the domestic economy.

Problem One: Absolute Advantage

A comparison where Country A produces 360 Iron and 300 Coal while Country B produces 280 Iron and 200 Coal, resulting in Country A holding the absolute advantage in both industries ($360 > 280$ and $300 > 200$).

Problem One: Comparative Advantage

A comparison showing that Country B holds the comparative advantage in Iron because its iron-to-coal ratio is higher ($280/200 > 360/300$), while Country A holds the comparative advantage in Coal.

Problem Two: Dispersed Advantages

A scenario where Country C (170 Iron, 320 Coal) and Country D (260 Iron, 200 Coal) each hold an absolute and comparative advantage in different activities: Country C in coal ($320 > 200$) and Country D in iron ($260 > 170$).