6. International economic issues

Absolute advantage means producing more with the same resources or using fewer resources for a product. Comparative advantage means producing it at a lower opportunity cost relative to another producer.

Trade can benefit both sides when each specialises according to comparative advantage and the agreed terms of trade allow both to consume beyond their own production possibilities.

If Country A gives up 2 units of cloth to make 1 unit of food while Country B gives up 5, A has comparative advantage in food—even if B can produce more food per worker in absolute terms.

Absolute advantage alone does not determine the trade pattern; calculate opportunity costs before claiming who should specialise.

Specialisation means concentrating resources on a narrower range of products; international specialisation follows comparative advantage. Free trade allows countries to exchange output without protective barriers.

Specialisation can raise productivity through learning and scale, widen consumer choice and let each country consume beyond its own production possibility frontier. Gains depend on transport, reliable institutions, terms of trade and the ability of workers and firms to adjust.

A country specialising in a product with low opportunity cost can export it and import a product it gives up relatively more of, provided the trading price lies between the two opportunity costs.

Free trade gains are not proof that every worker or region gains immediately; the aggregate benefit can coexist with concentrated adjustment costs.

The terms of trade (TOT) index compares an economy’s export price index with its import price index, commonly as export prices divided by import prices times 100.

An improvement means export prices have risen relative to import prices, so a given volume of exports can buy more imports. The welfare effect depends on export and import volumes, elasticities, concentration and who receives the income.

If export prices rise 12% and import prices rise 4%, the TOT improves approximately 7.7% using index ratios, not simply “8 percentage points” in every calculation.

A better TOT does not guarantee a better trade balance: quantities may change, and an export price rise can reduce export volume.

The simple comparative-advantage model assumes, among other things, limited transport costs, competitive markets, known opportunity costs, mobile resources within countries and no harmful externalities.

Real economies have economies of scale, changing technology, imperfect competition, trade costs, environmental damage and workers who cannot move quickly between sectors. These factors can change the size or distribution of gains.

A cheap imported product may reflect genuine efficiency, but if its production creates unpriced pollution, the market price understates the social cost and the simple welfare conclusion is incomplete.

A model’s conclusion is conditional, not a guarantee that every observed trade pattern or policy follows directly from comparative advantage.

Protectionism is government action that restricts or makes imports more expensive, or supports domestic producers relative to foreign competitors.

Governments may seek to protect jobs, support infant industries, improve bargaining power or address a strategic concern. The policy changes prices, quantities and incentives, so the domestic gain must be weighed against consumer costs and retaliation.

A tariff raises the domestic price above the world price, reducing imports and increasing domestic supply, but consumers lose purchasing power and some mutually beneficial trades disappear.

Protectionism is not the same as any trade regulation: a safety standard may be non-discriminatory, while a protectionist measure deliberately shields domestic output.

A tariff is a tax on imports; a quota is a quantity limit; a domestic or export subsidy lowers a producer’s effective cost; an administrative barrier raises the time or compliance cost of importing.

Tariffs generate government revenue, while quotas create quota rents for whoever receives licences. Subsidies use public funds, and administrative barriers may be difficult to measure. All can change domestic price, quantity and welfare in different ways.

A binding quota fixes the import quantity even if domestic demand rises; a tariff instead lets imports respond to demand while the tax wedge remains, so their diagrams and incidence differ.

Do not treat every barrier as a tariff: revenue, rent ownership and quantity response depend on the instrument.

Arguments for protection include infant-industry support, prevention of dumping, strategic supply security, employment and government revenue. Arguments against include higher prices, less choice, deadweight loss, retaliation and weaker competitive pressure.

Whether a protection measure works depends on time horizon, market power, elasticity, enforcement and whether the protected industry actually becomes productive. A temporary, targeted measure is not equivalent to permanent shelter.

A new industry may learn behind a time-limited tariff, but if firms lobby to keep it after productivity fails to improve, consumers continue paying more and resources remain misallocated.

“Protecting jobs” does not count only jobs saved: include jobs lost elsewhere, consumer costs, retaliation and the opportunity cost of public support.

The current account of the balance of payments records trade in goods and services, primary income such as wages and investment income, and current transfers such as remittances or aid.

Goods and services are often separated because a country can run a surplus in one and a deficit in the other. Primary income reflects payments for factors owned across borders; transfers have no direct exchange of a good or service.

A country may export machinery, import tourism services, receive dividends from overseas assets and send remittances abroad. Each belongs to a different current-account component.

The current account is not just the visible trade balance, and a transfer is not automatically a capital-flow item.

The current-account balance equals the balance on goods plus the balance on services, primary income and current transfers. A surplus means credits exceed debits; a deficit means the reverse.

Keep the sign convention consistent. Exports and receipts are credits; imports and payments are debits. Values in a question may be given as positive categories, so label the subtraction before adding.

A goods surplus of 30, services deficit of 12, primary-income deficit of 8 and transfer surplus of 2 give a current-account surplus of 12.

Do not add every printed number as a positive contribution; the economic direction of each flow determines its sign.

A current-account deficit can arise when domestic spending exceeds income, imports exceed exports, competitiveness is weak, or net income and transfers flow outward. A surplus is the corresponding excess of receipts.

Short-run causes include a demand boom or temporary commodity-price change; structural causes include productivity, exchange rates, export composition, demographics and saving-investment patterns. Use evidence before labelling an imbalance “bad”.

An investment boom may increase imports of capital goods and create a temporary deficit; persistent low productivity and weak export demand suggest a different, structural explanation.

A deficit is not caused only by “buying too much abroad”, and a surplus is not automatically evidence of superior welfare.

A persistent current-account deficit must be financed by capital inflows, reserve changes or borrowing; a surplus supplies net funds abroad. The consequence depends on how durable and productive the flows are.

Deficits can support investment and consumption, but may increase external debt or vulnerability if confidence falls. Surpluses can build foreign assets, yet weak domestic demand or dependence on exports may create adjustment risks.

A deficit financed by foreign direct investment in productive factories differs from one financed by short-term borrowing for consumption; both appear as external financing but have different risks.

A current-account deficit is not itself proof of insolvency, and a surplus does not guarantee balanced domestic living standards.

The exchange rate tells how much of one currency is needed to buy a unit of another. Always state the quotation convention before interpreting appreciation or depreciation.

If £1 buys more dollars than before, sterling has appreciated against the dollar under that quotation. The market price reflects demand and supply for currencies, arising from trade, investment, interest expectations and confidence.

If £1 rises from $1.25 to$1.30, sterling has appreciated against the dollar; UK imports priced in dollars become cheaper in pounds, other things equal.

“A stronger exchange rate” is meaningless without naming the currency and quote direction, and a market rate is not the same as purchasing-power parity.

Under a floating exchange-rate system, the currency price is mainly determined by market demand and supply rather than a fixed official parity.

Higher demand for exports, domestic assets or the currency’s interest-bearing deposits tends to appreciate it; greater demand for imports or foreign assets tends to depreciate it. Expectations can move the rate before the underlying trade changes.

If overseas investors expect higher returns in a country, demand for its currency may rise and the currency appreciates, potentially making exports less competitive later.

Floating does not mean “random” or “without central-bank influence”; intervention and interest decisions can still affect demand and supply.

A currency appreciates when its market value rises against another currency; it depreciates when its market value falls. The meaning depends on the quotation used.

Appreciation can make imports cheaper in domestic currency and exports more expensive to foreign buyers. Depreciation tends to do the reverse, but the final trade effect depends on elasticities, contracts and the time taken to change quantities.

If £1 moves from $1.20 to$1.30, sterling appreciates against the dollar. If it falls to $1.10, sterling depreciates; a US-dollar input then costs more pounds, other things equal.

Do not call a currency “stronger” without naming the comparison, and do not infer a guaranteed trade-balance improvement from depreciation alone.

A depreciation raises the domestic-currency price of imports and lowers the foreign-currency price of exports, subject to the quotation convention. An appreciation generally reverses these effects.

The short-run trade balance may worsen if contracts and quantities are slow to respond—the J-curve pattern. Later, export and import elasticities determine whether the value of trade improves. Imported input costs can also create cost-push inflation.

After a depreciation, an airline buying fuel in dollars faces higher domestic costs even if its passenger prices are unchanged. Exporters may gain competitiveness, but the net trade effect depends on demand responses.

Currency depreciation is not a free competitiveness gain: imported inflation and foreign-currency debt can offset benefits.

A depreciation may increase net exports and shift aggregate demand right; an appreciation may reduce net exports and shift AD left. The effect is conditional, not automatic.

Pass-through to prices, import content of exports, elasticities, spare capacity and retaliation affect the result. A depreciation can raise SRAS costs through imported inputs, so output and prices may move in opposing directions.

If export demand is elastic and imported inputs are a small share of production, depreciation can raise net exports and output. If imports are essential and inelastic, the cost shock may dominate initially.

An exchange-rate movement is not itself an AD curve shift unless you identify the spending or net-export channel it changes.

Current-account stability means an external position that can be financed without an abrupt crisis and is consistent with sustainable output, employment and living standards—not necessarily an exact zero every year.

Temporary deficits can finance productive investment, while temporary surpluses can reflect a commodity boom. The key questions are duration, financing quality, debt-service capacity, exchange-rate flexibility and whether domestic demand is being unnecessarily compressed.

A deficit used to build export capacity may be sustainable if future income services the borrowing; the same deficit used for repeated consumption is more vulnerable when capital inflows reverse.

“Balance the current account every year” is not the objective; forcing zero can sacrifice useful investment or demand.

Policies for a current-account deficit can include demand management, supply-side improvements, exchange-rate adjustment, trade diversification and measures that change saving or investment.

Contractionary demand policy may reduce imports but at the cost of output and employment. Supply-side and competitiveness policies take longer; depreciation may help exports but can raise imported inflation and debt costs. A surplus may call for stronger domestic demand rather than export restraint.

If a deficit comes from an overheating consumption boom, tighter fiscal policy may help. If it comes from weak productivity, training and infrastructure address the mechanism more directly.

There is no universal “deficit policy”; match the instrument to the cause and evaluate side effects, timing and who bears them.