What is the terms of trade?

The terms of trade (TOT) is the ratio of a country's export prices to its import prices, typically expressed as an index. If a country's export prices rise 10% while its import prices rise only 5%, its terms of trade improve by roughly 5%. Improving terms of trade mean a country can purchase more imports for each unit of exports, effectively increasing national purchasing power. Deteriorating terms of trade mean the country must export more to purchase the same volume of imports.

For commodity-exporting countries, the terms of trade are heavily influenced by global commodity prices. Australia, Canada, Brazil, and Norway experience significant terms of trade improvement when oil, iron ore, and agricultural prices rise, because these commodities dominate their exports. Conversely, commodity-importing countries like Japan, South Korea, and much of Europe suffer deteriorating terms of trade when commodity prices spike. The 2022 energy price surge dramatically improved the terms of trade for oil exporters while devastating the terms of trade for importers like Germany and Japan.

The terms of trade have a direct impact on exchange rates. Countries experiencing improving terms of trade typically see their currencies appreciate because they are receiving more foreign currency for their exports. This relationship is particularly strong for commodity currencies (the Australian dollar, Canadian dollar, Norwegian krone) which are closely correlated with commodity price indexes. Conversely, deteriorating terms of trade put depreciation pressure on the exchange rate as the country needs more domestic currency to purchase the same volume of imports.

For economic analysis, persistent terms of trade deterioration can reduce living standards even in a growing economy. If a country's GDP grows 3% but its terms of trade deteriorate by 2%, the real income gain for its citizens is only about 1%. This is why economists track "real gross domestic income" (GDI), which adjusts for terms of trade effects, alongside real GDP. Understanding the terms of trade is essential for assessing the true economic welfare of nations whose trade composition is concentrated in specific commodity or manufactured goods categories.