International trade is simply the exchange of goods and services between countries — through exports (goods/services sold to other countries) and imports (goods/services bought from other countries).

Trade is called "free" when there are no government restrictions at all — no taxes on imports, no limits on quantities, nothing artificially blocking the natural flow of goods between countries. Think of it like a market with the border gates wide open: goods move to wherever they're wanted, at whatever price the market decides.

Imagine two neighbouring countries — one brilliant at growing coffee, one brilliant at making machinery. If they trade freely, each can focus on what they're best at (this is called specialisation) and swap the surplus. Everyone ends up with more of both goods than if each country tried to make everything itself. That's the whole logic behind free trade's benefits:

• Greater choice — access to a wider variety of goods/services raises the standard of living.
• Lower prices — international competition forces prices down, so households can buy more with the same income.
• Increased sales — bigger markets let firms achieve economies of scale (lower cost per unit from producing more), spread risk across more customers, and boost revenue.
• Lower input costs — firms get cheaper access to raw materials and labour from abroad, which cuts production costs and boosts profit.

Free trade isn't a win for everyone, everywhere, all the time. It tends to create winners and losers — and who wins depends heavily on whether you're a developed or developing country.

Free trade aims to maximise global output through specialisation at a national level (e.g. Germany specialising in highly technical capital goods). But countries often have good reasons to want to limit free trade to protect their own markets and jobs from too much competition. This deliberate limiting of trade is called protectionism, and it usually takes one of three forms:

• Import tariffs — taxes on imports
• Export subsidies — payments to help domestic firms compete
• Quotas or embargoes — physical limits or total bans on imports

A tariff is a tax on imported goods or services — also called a customs duty. It raises the price of the import, which makes it easier for domestic firms to compete and grab market share, as consumers switch from buying imports to buying domestic goods instead.

Here's the catch worth remembering: this protects less efficient domestic firms — but at the direct expense of more efficient foreign firms, who now have a tax slapped onto their product.

• The pre-tariff market equilibrium sits at P₁Q₁.
• After the tariff, less British cheese is imported, so the supply curve shifts S₁ → S₂.
• The new equilibrium is at P₂Q₂ — price rises (P₁ → P₂), and following the law of demand, the quantity demanded contracts (Q₁ → Q₂).

Benefits:

• Protects infant industries so they can eventually compete globally
• Raises government tax revenue for essential services like healthcare
• Reduces dumping, since foreign firms can't undercut the market price

Drawbacks:

• Raises the cost of imported raw materials — pushes up prices for consumers
• Reduces competition, so domestic firms may become inefficient and produce poorer quality goods
• Reduces consumer choice, since some can no longer afford the now-pricier imports

A quota is a physical limit on how much of a good can be imported — set below the free market level. Example: in June 2022, the UK extended its quota on steel imports for two more years to protect jobs in the domestic steel industry.

Because cheaper imports are now capped, a quota can create a shortage, and shortages push the market price up. Domestic firms benefit because they can supply more of the market — which can boost domestic employment.

Benefits:

• To meet extra demand, domestic firms may hire more workers — reduces unemployment
• Higher prices may encourage new domestic businesses to start up
• Governments can easily adjust quotas as market conditions change
• Foreign countries see quotas as less confrontational than tariffs — exporters can still sell (just a limited amount) at a higher price

Drawbacks:

• Limiting supply always raises the price of the product
• Can generate tension with trading partners
• Domestic firms may become less efficient over time, since competition is reduced

A subsidy is money paid by the government to a firm for every unit it produces. This lowers the firm's cost of production, letting it increase output and lower prices — making its goods more competitive internationally, boosting exports and potentially domestic employment.

Think of the EU providing a subsidy to solar panel retailers to hit climate targets. This shifts supply from S₁ → S₂. At the original price P₁, there's now an excess supply (more solar panels than buyers want at that price), so sellers lower prices to clear the surplus. This causes an expansion of demand and a contraction of supply, settling at a new equilibrium P₂Q₂ — lower price, higher quantity than before.

A trading bloc is a group of countries that agree to reduce or eliminate trade barriers between themselves. There are more than 420 regional trade agreements active worldwide (2022) — and they exist on a spectrum of increasing economic integration. Think of it as four escalating levels of "closeness":

A good way to picture the FTA level: Mexico, Canada, and the USA trade freely with each other, but each is still free to deal with a non-member (say, Cuba) however it wants — the USA might embargo Cuba completely, Canada might trade but tax it, and Mexico might trade freely with it.

• The European Union (EU) — a common market formed in 1993, 27 members as of 2024, with free movement of goods, services, labour and capital, plus a common external tariff. The UK left in 2020.
• ASEAN (Association of Southeast Asian Nations) — formed 1967, 10 members by 2024. Less integrated than the EU — it's a free trade area only, with no free movement of people or capital.
• USMCA — replaced NAFTA in 2020. Many US firms relocated manufacturing to Mexico (cheaper wages), then imported products back to the USA tariff-free. Mexico gained jobs and new industries, though mostly concentrated near the US border.

The WTO was established in 1995 to promote free trade, believing it's the best way to raise global living standards, create jobs, and improve people's lives. Trade liberalisation is the process of rolling back barriers to free trade (e.g. removing tariffs).

The WTO has two main roles:

1. Brings countries together at conferences (e.g. The Doha Round) to encourage reducing/eliminating protectionist barriers
2. Acts as an adjudicating body in trade disputes — member countries can file complaints if a trading partner breaks a trade agreement, and the WTO runs a hearing (though it can take years)

Other actions: trade negotiations, monitoring trade agreements, dispute settlement, building trade capacity, and government outreach.

Patterns of trade have changed massively over time. Global export of goods rose from almost nothing in 1950 to around $25 trillion by 2022 — driven by improved transportation, technological advancements, the formation of trading blocs, and trade liberalisation.

Historically, developed countries like the UK and USA dominated global trade. But emerging economies — China, Brazil, India, Thailand — are now overtaking them in trade volume. China is now the world's largest manufacturing economy and leading exporter, with exports of goods reaching around $3.38 trillion in 2023, mostly manufactured goods (like electronics) traded with the USA, ASEAN, and the EU.

However, many developing countries remain overly dependent on exporting a narrow range of primary commodities (raw materials, not manufactured goods). For example, in Zambia (2022), raw copper alone made up 44.5% of exports, and refined copper another 18.6% — so copper made up over 63% of all Zambia's exports, with primary products overall exceeding 90%. This kind of over-specialisation makes a country very vulnerable to price volatility — if the world copper price crashes, so does Zambia's export income.