International Trade – Week 5 Comprehensive Study Notes

Overview of International Trade

• Week-5 focus: why nations trade, who gains/loses, and why governments still erect barriers.

• Fundamental insight: even when barriers create inefficiency (deadweight loss), they persist for political, fiscal, and distributive reasons.

Core Definitions & Facts

• Import: domestic purchase of foreign-produced goods/services.

• Export: domestic sale of goods/services to foreigners.

• Trade volume: $\text{Imports}+\text{Exports}$; scales with country size.

  • 2022 world merchandise trade ≈ $\$22\,\text{trillion}=22\times10^{12}$.

Comparative Advantage (CA)

• CA = ability to produce at lower opportunity cost relative to others.

• Drives pattern of trade; exists at individual, firm, or national level.

• Example:

  • Labour-abundant developing nations ⇒ CA in T-shirts (labour-intensive).

  • Capital-abundant Canada ⇒ CA in aircraft (capital/skill-intensive, e.g.
    Bombardier).

Model 1 – Canada Imports T-Shirts

A. Autarky (no trade)

• Standard Supply (S) & Demand (D) intersect → $P<em>{dom}=8,\;Q</em>{dom}=4$ (illustrative).

• Surpluses:

  • Upper triangle: Consumer Surplus (CS).

  • Lower triangle: Producer Surplus (PS).

B. Free Trade (world price $P_w=5$)

• Domestic consumers can buy at $5$.

• Consequences:

  • CS expands; added triangle = "gain from trade".

  • PS shrinks (many firms exit).

  • Import volume $M = Q<em>D(5)-Q</em>S(5)=6-2=4$.

• Winners/Losers:

  • Winners: domestic consumers (lower $P$, higher $Q$).

  • Losers: domestic producers (lower $P$, lower sales).

Model 2 – Canada Exports Aircraft

A. Autarky

• Equilibrium: $P<em>{dom}=100,\;Q</em>{dom}=40$.

B. Free Trade (world price $P_w=150$)

• Canada exports because $P<em>w>P</em>{dom}$.

• Consequences:

  • PS expands (yellow triangle = gain from trade).

  • CS shrinks (domestic buyers face higher $P$ & reduced availability).

  • Export volume $X = Q<em>S(150)-Q</em>D(150)$ (gap between supply & domestic demand).

• Winners/Losers:

  • Winners: domestic producers (higher $P$, larger output).

  • Losers: domestic consumers (higher $P$, lower $Q$).

World Trade Organization (WTO)

• >100 member states.

• Monitors, adjudicates, and disciplines unfair practices (tariffs beyond bindings, illegal subsidies, import bans, etc.).

Four Main Trade-Policy Tools

1. Tariff – per-unit (specific) or ad valorem tax on imports.

2. Import Quota – quantitative limit on imports.

3. Non-Tariff Barriers (NTBs) – health, safety, environmental standards, licensing, bureaucracy.

4. Export Subsidy – government payment to domestic exporters (generally WTO-illegal).

Tariff Analysis – $2 on Imported T-Shirts

Pre-Tariff Benchmark

• Same as free-trade case above: $P_w=5,\;M=4$.

Post-Tariff Outcome

• Domestic price rises to $P<em>T=P</em>w+2=7$.

• New quantities: $Q<em>S(7)=2.5,\;Q</em>D(7)=3.5$ (illustrative), so $M_{new}=1$.

• Fiscal effect: Government revenue $R = t\times M = 2\times1 = 2$ (yellow rectangle).

• Welfare decomposition:

  • CS ↓ (triangle lost + rectangle transferred).

  • PS ↑ (red expansion).

  • Government gains $R$.

  • Deadweight Loss (DWL) = two tiny triangles flanking the tariff rectangle.

• Incidence: Because world supply perfectly elastic, entire tariff borne by domestic consumers.

Import Quota – 1-Unit Limit on T-Shirts

• Implemented by shifting the effective supply curve left until import gap =1.

• Market price also rises to $7$ (mirrors tariff result).

• Distribution:

  • CS ↓, PS ↑, DWL exists.

  • Quota rents (green rectangle) captured by importers/license-holders, not government.

Non-Tariff Barriers & Export Restraints

• Health/Safety inspections (e.g.
  Canadian Food Inspection Agency) impose cost & delays → de facto barrier.

• Voluntary Export Restraints (VERs) – exporting nation "voluntarily" limits sales (often under threat).

• Export bans/controls – e.g.
  U.S. semiconductor ban to China (strategic, security driven).

• Export subsidies – lower producer cost to gain market foothold; WTO discourages but loopholes persist.

Motivations for Protectionism

1. Infant-Industry Argument – shield nascent sectors until competitive.

2. Anti-Dumping / Counteracting Dumping – respond to foreign firms pricing below cost (e.g.
   U.S. 100 % tariff on Chinese EVs).

3. Job Preservation – prevents layoffs & unemployment spikes.

4. Wage/Labour Competition – buffer against countries with cheap labour.

5. Environmental & Social Standards – penalize producers in nations with lax rules.

6. Prevent Exploitation of Developing Nations – avoid unequal terms of trade.

7. Curtail Offshore Outsourcing – keep “good Canadian jobs” onshore.

8. Government Revenue – tariffs an easier tax base than income tax in some nations.

9. Rent-Seeking & Lobbying – concentrated producer losses → powerful lobbies; diffuse consumer gains → weak opposition.

10. Retaliation & Trade Wars – tit-for-tat escalation erodes trade gains.

Political-Economy Note: Compensation for Losers

• In principle, government could redistribute tariff revenue or tax gains to those hurt by trade ("Pareto improvement").

• Practically difficult: identifying losers, administrative complexity, imperfect take-up of programs (e.g.
  unemployment insurance).

Key Takeaways

• Comparative advantage underpins gains from trade, but distribution is uneven.

• Tariffs & quotas reallocate surplus toward producers (and government/importers) at consumer expense, while generating DWL.

• NTBs and subsidies can mimic tariff/quota effects with different incidence.

• Protection persists due to political power, revenue needs, strategic concerns, and retaliatory dynamics.

• WTO provides rules but enforcement and loopholes leave room for continued barriers.

• Understanding both economic models and political incentives is essential for informed trade policy analysis.