Why Japan’s Yen Can Move the U.S. Stock Market

Why Japan’s Yen Can Move the U.S. Stock Market

It may sound strange, but movements in the Japanese yen can have a big impact on the U.S. stock market. Even though American stocks are priced in dollars, some of the money used to buy them can come from borrowing in yen.

This is known as the yen carry trade.

For many years, Japan kept interest rates extremely low. In some periods, rates were close to zero, and in 2016 they even turned negative. This meant borrowing money in Japan was very cheap compared with many other countries.

Because of this, global investors could borrow yen at a low cost, convert that money into dollars, and then invest it into assets that offered higher returns. These assets could include U.S. shares, bonds, credit markets, or emerging markets.

In simple terms, investors were borrowing cheaply in Japan and using that money to buy higher-return investments elsewhere.

When this trade works, it can support stock markets. A weak yen keeps borrowing costs low, investors take more risk, and assets such as U.S. technology shares can rise. This can make the trade feel like easy money.

However, the risk comes when the yen starts to rise or when the Bank of Japan increases interest rates. If borrowing in yen becomes more expensive, investors may need to close their trades. That can mean selling U.S. stocks or other risk assets to repay yen loans.

This is why a sharp move in the yen can affect companies such as Apple, Nvidia or other major U.S. tech stocks, even if those companies have not changed fundamentally.

For beginner traders, the lesson is simple: markets are connected. U.S. stocks are not only driven by earnings, interest rates and news in America. They can also be affected by global funding conditions.

That is why many traders keep an eye on the dollar-yen exchange rate. If Japan raises rates or the yen strengthens quickly, risk assets could come under pressure.