Imports, exports, specialisation and comparative advantage
Trade means importing and exporting; countries specialise where they have a comparative advantage, then trade.
International trade is the buying and selling of goods and services between countries. It has two sides:
- Exports — goods and services a firm/country sells to other countries. Exports bring money into the economy.
- Imports — goods and services a firm/country buys from other countries. Imports send money out.
The balance of trade measures the difference:
- Balance of trade = value of exports − value of imports.
- A trade surplus means exports exceed imports; a trade deficit means imports exceed exports.
Why trade happens — specialisation. No country can produce everything most efficiently, so countries specialise in what they are best at and trade for the rest. Specialisation raises total output and efficiency, giving consumers more goods, more cheaply, than if each country tried to make everything itself.
Comparative advantage (the simple idea). A country has a comparative advantage in a good if it can produce it at a lower opportunity cost than other countries — that is, giving up less of other output to make it. The theory says total world output rises if each country specialises in the goods where its opportunity cost is lowest and trades for the others. This is the economic logic behind why trade benefits everyone, even when one country is more efficient at making everything.
For businesses, the practical upshot is simple: trade lets a firm sell where demand is strongest and source inputs where they are cheapest, rather than being confined to its home country.
- Exports = selling abroad (money in); imports = buying abroad (money out).
- Balance of trade = exports − imports (surplus or deficit).
- Specialisation: countries focus on what they produce most efficiently, then trade.
- Comparative advantage: specialise where opportunity cost is lowest.
- Trade lets firms sell where demand is highest and source inputs cheapest.
See the full worked example for international trade and business growth →