Describe international trade (meaning, advantages, disadvantages, terms of trade, balance of payments, absolute and comparative advantage and protectionism)

International trade brings several benefits:

• Welfare increase: Lower prices, greater choice, and higher incomes for consumers.
• Increased world production: Specialization leads to more efficient resource use and higher total output.
• Technology transfer: Trade facilitates the exchange of technical knowledge and encourages foreign direct investment (FDI).
• Strengthened international relationships: Trade builds trust and cooperation among nations.
• Source of foreign exchange: Exports earn foreign currency needed to pay for imports.
• Government revenue: Taxes on imports and exports increase state income.
• Stimulates local competition: Exposure to foreign competition improves domestic industry efficiency.
• Expands markets: Producers access larger markets beyond their national borders.

Despite its benefits, international trade has drawbacks:

• Undermines infant industries: Young domestic industries may struggle against established foreign competitors with economies of scale.
• Destruction of moral values: Harmful imports like illicit drugs can damage societal values.
• Slows economic growth: Over-specialization in one product makes an economy vulnerable if demand falls.
• Over-exploitation of resources: Developing countries may export raw materials at low prices while importing expensive capital goods.
• Creates unemployment: Import competition can force domestic industries to close.
• Dumping: Foreign companies may sell goods below cost in other markets, harming local producers.

Terms of trade (ToT) is the ratio of export prices to import prices. It shows how much of an imported good a country must export to obtain one unit of an imported good.

$\text{Terms of Trade} = \frac{\text{Export Price Index}}{\text{Import Price Index}} \times 100$

Types of Terms of Trade

• Favourable (ToT > 100): Export prices are higher than import prices; the country gets more imports per unit of export.
• Unfavourable (ToT < 100): Import prices exceed export prices; the country must export more to obtain the same imports.
• Balanced (ToT = 100): Export prices equal import prices.

Methods of Measuring Terms of Trade

1. Net barter terms of trade: $\text{ToT} = \frac{P_x}{P_m} \times 100$ where $P_x$ is export price index and $P_m$ is import price index.
2. Gross barter terms of trade: $\text{ToT} = \frac{Q_x}{Q_m} \times 100$ where $Q_x$ is quantity exported and $Q_m$ is quantity imported.
3. Income terms of trade: $\text{ToT} = \frac{P_x \times Q_x}{P_m}$

Determinants of Terms of Trade

• Trade restrictions (tariffs and quotas)
• Export subsidies
• Degree of market monopolization
• Market forces of demand and supply
• Exchange rates
• Consumer tastes and preferences

The balance of payments (BoP) is a summary statement recording all economic transactions between residents of one country and the rest of the world during a specific period, usually one year.

Equilibrium and Disequilibrium

• Surplus BoP: Receipts from abroad exceed payments abroad (favourable BoP).
• Deficit BoP: Payments abroad exceed receipts from abroad (unfavourable BoP).

Main Accounts of BoP

1. Current Account: Records exports and imports of goods (visible) and services (invisible), including trade balance, services, income, and current transfers.
2. Capital Account: Records receipts from foreign acquisition of domestic assets and payments for foreign assets.
3. Financial Account: Includes direct investment, portfolio investment, and other investment.
4. Reserves Account: Records changes in foreign exchange reserves held by the central bank.

Mercantilism (1500–1750)

Mercantilism emphasized that a nation's wealth consisted of precious metals (gold and silver). Countries were encouraged to export more than they imported, with the surplus settled in gold and silver. This theory promoted trade restrictions like tariffs and quotas.

Absolute Advantage

Developed by Adam Smith, this theory states that a country should specialize in producing goods it can make more efficiently (using fewer resources) than other countries and import goods it produces less efficiently.

Worked Example: Absolute Advantage

Assume Tanzania and Uganda each have 20 labour hours to produce cotton and coffee:

Tanzania produces more cotton per hour, so it has an absolute advantage in cotton. Uganda produces more coffee per hour, so it has an absolute advantage in coffee. Both countries benefit if Tanzania specializes in cotton and Uganda in coffee, then trade.

Comparative Advantage

David Ricardo's theory states that even if a country has an absolute advantage in producing both goods, it should specialize in the good with lower opportunity cost and trade for the other good.

Worked Example: Comparative Advantage

Calculating opportunity costs:

• Tanzania: To produce 20 tons of cotton, sacrifice 10 tons of coffee. Opportunity cost of 1 ton cotton = 10/20 = 0.5 tons of coffee.
• Uganda: To produce 10 tons of cotton, sacrifice 8 tons of coffee. Opportunity cost of 1 ton cotton = 8/10 = 0.8 tons of coffee.

Tanzania has a lower opportunity cost in cotton (0.5 < 0.8), so it should specialize in cotton. Uganda has a lower opportunity cost in coffee, so it should specialize in coffee. Both countries benefit from trade.

Trade protectionism refers to government policies that restrict imports to protect domestic industries from foreign competition. Common measures include:

Forms of Protectionism

• Import tariffs: Taxes on imported goods (specific: fixed amount per unit; ad-valorem: percentage of value).
• Import quotas: Limits on the quantity of specific imports.
• Exchange rate controls: Restrictions on foreign currency purchases.
• Subsidies: Government financial support to domestic producers.
• Voluntary export restraints: Agreements to limit exports.
• Devaluation: Reducing the value of domestic currency to make exports cheaper and imports expensive.
• Total ban (embargo): Complete prohibition of certain imports.

Arguments For Protectionism

• Improves balance of payments by reducing imports
• Protects strategic and infant industries
• Increases government revenue
• Reduces dumping
• Allows retaliation against unfair trade practices
• Controls imported inflation
• Protects national culture and values

Arguments Against Protectionism

• Creates monopolies that exploit consumers
• May cause inflation when demand is price inelastic
• Invites retaliation from other countries
• Reduces the volume of trade
• Reduces consumer welfare through higher prices

A Tanzanian secondary school student whose family runs a small-scale maize mill in Mwanza would encounter international trade concepts when their family imports grinding machines from China (comparative advantage in manufacturing) or exports processed maize flour to Uganda. If the government imposes tariffs on imported milling equipment, the family faces higher costs—this directly illustrates how protectionism affects local businesses and why understanding terms of trade matters for small entrepreneurs making pricing and sourcing decisions.