International Economics: Trade Models, Policies, and Factor Mobility

Vocabulary flashcards covering Ricardian trade theory, the Gravity Model, the Specific Factors model, international labor migration, and the Heckscher-Ohlin model.

International Economics

The branch of economics that studies interactions among sovereign nations through trade in goods and services, cross-border monetary flows, and international investment flows, divided primarily into international trade theory and international monetary economics.

Degree of Openness

An economic metric expressing international trade volume as a percentage of gross domestic product ($\text{GDP}$); large economies such as the United States tend to be relatively less integrated than smaller economies, despite a generalized global increase in international openness since 1970.

Tariff of Abominations (1828)

A historic high-tariff legislation enacted in the United States following political maneuvering between Republicans and Democrats that raised average tariff rates to approximately $62\%$ on dutiable imports, inflicting severe bankruptcy on domestic firms.

Gravity Model of Trade

A baseline trade model predicting that the volume of trade $T_{ij}$ between country $i$ and country $j$ is directly proportional to the product of their national incomes ($Y_i \times Y_j$) and inversely proportional to the geographic distance $D_{ij}$ separating them: $T_{ij} = A \times Y_i \times Y_j / D_{ij}$.

Border Effect

The reduction in trade volume caused by international administrative and political borders due to formalities and regulatory differences, demonstrated by the fact that Canadian provinces trade substantially more among themselves than with neighboring US states sharing identical languages and physical proximity.

Composition of World Trade

The sectoral distribution of modern international merchandise and commercial exchange, comprising manufactured goods ($56.5\%$), services ($23.5\%$), fuels and mining products ($12\%$), and agricultural products ($8\%$).

Offshoring of Services

The corporate practice of relocating service-providing operations abroad, primarily restricted to tradable services that can be transmitted electronically across distances with negligible loss in service quality (e.g., call centers).

Opportunity Cost

The value of alternative goods that must be sacrificed to produce one additional unit of a chosen good; in a two-good economy producing food and cloth, the opportunity cost of food is given by the ratio of unit labor requirements $\frac{a_{Lc}}{a_{Ls}}$.

Comparative Advantage

The capability of an economy to produce a specific good at a lower opportunity cost relative to other trading partners, allowing mutually beneficial trade even when one trading partner possesses an absolute productivity disadvantage across all sectors.

Unit Labor Requirement ($a_{Li}$)

The constant quantity of labor hours required to produce a single physical unit of good $i$; it serves as the inverse measure of labor productivity, where a higher unit labor requirement signifies lower labor efficiency.

Production Possibility Frontier (Ricardian Model)

The boundary illustrating the maximum combination of two goods an economy can produce under fixed labor endowment $L$, defined by the linear constraint $a_{Lc} Q_c + a_{Ls} Q_s = L$, whose absolute slope equals the constant opportunity cost $\frac{a_{Lc}}{a_{Ls}}$.

Relative Wage

The ratio of the hourly wage paid in the domestic country to that paid in the foreign country, which settles between the two countries' relative productivities in the two industries and allows low-productivity countries to remain cost-competitive.

Specific Factors Model

A short-run international trade framework that assumes production requires a mobile factor (labor, $L$) capable of moving between sectors, alongside sector-specific immobile factors (such as capital, $K$, dedicated to cloth and land, $T$, dedicated to food).

Diminishing Marginal Returns to Labor

The technological property whereby adding successive units of mobile labor to a fixed endowment of a specific factor yields progressively smaller increments of total output, causing marginal product of labor ($MPL$) to fall as employment rises.

Labor Allocation Condition (Specific Factors Model)

The profit-maximizing equilibrium requirement in competitive factor markets stating that mobile labor distributes between sectors until the value of marginal product is equalized: $P_c \times MPL_c = P_s \times MPL_s = w$, or $-MPL_c / MPL_s = -P_s / P_c$.

Four-Quadrant Diagram (Specific Factors Model)

A multi-panel geometric tool that derives the curved production possibility frontier ($PP$) in the upper-right quadrant by integrating the economy's linear labor allocation constraint ($L_c + L_s = L$) with the diminishing-return production functions for food and cloth.

Income Distribution Effects of a Relative Price Change

In the specific factors model, an increase in the relative price of cloth ($P_s / P_c$) unambiguously raises the real return of capital owners (specific to cloth), lowers the real return of landowners (specific to food), and leaves the net welfare effect on mobile workers ambiguous depending on their consumption shares.

Budget Constraint (Open Economy)

The macroeconomic accounting relationship establishing that an economy cannot spend more than it earns, dictating that the value of consumption must match the value of production: $D_c - Q_c = \left(\frac{P_s}{P_c}\right) \times (Q_s - D_s)$.

International Labor Mobility

The cross-border relocation of workers driven by differences in real wage rates, which expands total world production (represented by the welfare triangle between marginal product curves) and drives real wage convergence between origin and destination countries.

Wage Convergence

The economic process where initial differences in real wages between integrating regions diminish over time, evidenced in the European Union where Eastern European manufacturing compensation rose from $14\%$ of Western European levels in 1997 to roughly double that percentage by 2015.

Heckscher-Ohlin Model

A long-run factor proportions theory of international trade positing that comparative advantage arises from national differences in factor endowments (labor and capital), predicting that nations export goods intensive in their abundant factors and import goods intensive in their scarce factors.

Factor Intensity

The relative proportions of capital and labor required to produce goods, designated such that cloth is labor-intensive relative to food if the labor-to-capital ratio in cloth exceeds that in food ($\frac{L_s}{K_s} > \frac{L_c}{K_c}$) at every factor price ratio $\frac{w}{r}$.

Isovalue Line

A geometric line displaying all output combinations of two goods that generate a constant aggregate market value ($V = P_s Q_s + P_c Q_c$); profit-maximizing output occurs at the tangency point between the highest reachable isovalue line and the production possibility frontier.

Stolper-Samuelson Relationship (NN Curve)

The theoretical relationship showing that an increase in the relative price of the labor-intensive good ($P_s / P_c$) leads to an increase in the relative wage-to-rental ratio ($w / r$), inducing firms across all sectors to substitute capital for labor and decrease their labor-to-capital ratios.