Global Trade and Currency: How International Finance Affects You

International economics might sound distant, but it determines the price of your phone, the cost of your groceries, and the value of your investments.

Why Countries Trade

Comparative advantage: Even if one country is better at producing everything, both countries benefit from specializing in what they produce most efficiently and trading.

The US is excellent at software and financial services. Vietnam excels at manufacturing. Both benefit from trading — the US gets cheap goods, Vietnam gets high-value services exports.

Trade Deficits

A trade deficit means a country imports more than it exports. The US has not held a surplus trade balance since 1975 ^[7]. In 2024, the U.S. goods and services deficit increased by $133.5 billion, or 17.0 percent, compared to 2023 ^[5]. Whether this is a problem is debated — it can reflect strong consumer demand and comparative advantage in services, not just economic weakness ^[4], ^[10].

Tariffs: Taxes on Imports

A tariff is a tax on imported goods. It raises the prices of foreign goods, making domestic alternatives more competitive.

Who pays tariffs? Usually domestic importers, who often pass these costs on to consumers through higher prices ^[1], ^[2]. For example, research indicates that tariffs on imported goods have led to an approximate 5% increase in prices for tracked consumer goods ^[1]. While tariffs are intended to protect domestic jobs, they can reduce overall economic efficiency and trigger retaliatory measures from trading partners, which may further impact export volumes ^[1], ^[9].

Currency and Exchange Rates

Exchange rates determine how much foreign currency your dollar buys. The U.S. dollar remains the dominant global currency, with an international usage index of 64.9 compared to 23.9 for the Euro and 3.1 for the Chinese Yuan ^[3].

Strong dollar:

• Imports get cheaper (good for consumers).
• Exports get more expensive for foreign buyers (bad for US manufacturers).
• Overseas profits of US companies shrink when converted back to dollars.

Weak dollar:

• Imports get more expensive.
• US exports become more competitive globally.
• Multinational company profits look better in dollar terms.

Purchasing Power Parity (PPP)

PPP theory suggests exchange rates should equalize the price of identical goods across countries. The Economist's "Big Mac Index" tests this — comparing the price of a McDonald's burger worldwide to detect currency over- or undervaluation.

Currency Pegs

Some countries fix their currency to the US dollar for stability. Maintaining a peg requires central bank intervention — buying or selling currency reserves. When reserves run out, pegs can break suddenly, causing financial crises.

The WTO

The World Trade Organization (est. 1995) sets global trade rules, reduces tariffs, and resolves disputes between member nations.

Key Takeaway

Global trade makes us all wealthier on average — but the benefits and costs are unevenly distributed. Currency moves affect your investments, purchasing power, and job market in ways that are easy to miss if you're not watching.