Trade, Tariffs, and Currencies

Why this matters

A company that imports parts, sells overseas, or competes with foreign producers is exposed to trade policy and exchange rates whether it chooses to be or not. Tariffs change what it pays. Exchange rates change what its foreign sales are worth in dollars. And the trade balance is one of the most quoted and most misread economic figures. This lesson takes each in turn and ends with what an investor should look for in a company's exposure.

Why countries trade

The case for trade rests on an idea that's easy to state and surprisingly easy to misunderstand: comparative advantage. A country benefits from producing what it gives up least to make, even if another country can make everything more efficiently.

Output from one day of a worker's time.

	Machines	Shirts	Cost of one machine, in shirts given up
Country A	4	20	5 shirts
Country B	1	10	10 shirts

Country A is better at both. But making a machine costs A only 5 shirts' worth of time and costs B 10. Shirts are the reverse: one shirt costs A a fifth of a machine and B only a tenth. If A makes machines, B makes shirts, and they trade at, say, 7 shirts per machine, both end up with more of both than they could make alone.

The gains are real and spread across the economy as lower prices and more variety. The costs fall on particular industries and places that lose out to imports, which helps explain why trade policy is so contested.

The trade balance

The trade balance is exports minus imports. In the second quarter of 2026, the US exported goods and services at an annual rate of $3.79 trillion and imported $4.67 trillion, a deficit of about $880 billion a year. The monthly deficit reached $133.0 billion in March 2025, the largest in a series that begins in 1992, and was $105.6 billion in August 2026.¹

A trade deficit is often described as the country losing. It's better understood as an accounting fact with two sides. When the US buys more from the rest of the world than it sells, the difference is paid for by the rest of the world acquiring US assets: Treasuries, shares, companies, property. A persistent deficit means foreigners are persistently investing in the US. Whether that's a sign of strength, of too little saving at home, or both, is an argument economists have without settling.

The trade balance also isn't a scorecard of a country's industries. It reflects saving and spending across the whole economy. Other things equal, faster growth at home means more spending on imports, which widens the deficit.

The rest of this lesson is for members

Still to come in this lesson: Tariffs, Currencies, Questions to ask about a company, the key takeaways, and 2 quiz questions with explanations.

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