The U.S. dollar has been strengthening considerably over the last few months, with the WSJ Dollar Index hitting its highest point since September 2020. There are a few factors arguably driving the dollar higher – the U.S. economy is strong relative to the rest of the world, and the Federal Reserve is about to engage in the ‘tapering’ of monthly bond and mortgage security purchases (QE). A strong economy plus tightening financial conditions generally equals a stronger dollar.1

Federal Reserve policymakers have also been commenting more on sticky inflation in the U.S. economy, which has been pushing up the timeline for possible rate increases. Up until recently, the market had been anticipating no interest rate hikes until 2023, but now some believe the first interest rate increase could come as soon as next summer. If the U.S. is indeed entering a tightening cycle, it could mean constricted supply of U.S. dollars (and more dollar strengthening as a result).

For the U.S. economy, the impact of a strengthening dollar depends on who you are. Companies in the S&P 500 (large-cap) generate approximately 40% of their revenue from abroad, so a strengthening dollar is generally negative – it weakens the value of international sales. Foreign demand may also fall over time if strengthening is sustained since a stronger dollar means less purchasing power for consumers in foreign countries. On the other hand, small- and mid-cap U.S. companies are generally less impacted by a stronger dollar, since many sales are generated domestically.

What about the impact of a stronger dollar on equity markets? As ever, history may be our best guide.

The chart below takes a look at the foreign exchange value of the U.S. dollar against the cost of goods and services of advanced economies like the Euro Area, Japan, and England. The green arrows on the chart signify times when the U.S. dollar was strengthening, while the red arrows show periods of dollar weakening. As you can see, the U.S. dollar routinely shifts from periods of strengthening to weakening, and back again.

U.S. Dollar Strengthening (Green) and Weakening (Red)

Source: Federal Reserve Bank of St. Louis2

There are several notable periods, but the first to highlight is the dollar surge in 2014. Indeed, from July 14 to December 2016, the U.S. dollar strengthened by 21% – a significant jump. Similar to the current environment, the dollar was strengthening in 2014 because the Fed was unwinding its post-Great-Recession QE program, which eventually gave way to interest rate increases beginning in December 2015. Here’s what the S&P 500 did over the same period:

The S&P 500 from July 2014 to December 2016

Source: Federal Reserve Bank of St. Louis3

As you can see, the S&P 500 endured a choppy period and moved only slightly higher, but there was another key factor in play besides Fed tightening and a stronger dollar: U.S. corporate earnings (as measured by year-over-year earnings per share growth) were down -11% in 2015. As the Fed was tightening and the dollar was strengthening, it was a weak year for profits in what we now know was a mid-cycle pause.

Another period at which to look more closely is the dollar weakening in 2017 (red line labeled “2” in the chart). In that year, the U.S. dollar slipped 10% against a basket of advanced foreign currencies, which was the biggest decline in over a decade. Yet in 2017, the S&P 500 was up +19%.

This quick look at history may lead one to conclude that a stronger dollar is bad for stocks and a weaker dollar is good for stocks. But a zoomed-out look at history suggests a much weaker correlation between the U.S. dollar and U.S. stocks. On the S&P 500 chart below, I’ve labeled the periods of dollar strengthening (green arrows, numbers correspond to chart above) and dollar weakening (red). As you can see, the stock market does not have a firm preference on which way the dollar moves. Stocks have managed to do well under both strengthening and weakening regimes.

The S&P 500 Since 2012

Source: Federal Reserve Bank of St. Louis4

Bottom Line for Investors

In 2014 and 2015, the dollar was surging and the stock market was wobbling, which understandably leads some investors to link the two. But the real factor driving the volatility and sideways move in equity markets in those years, in my view, was the decline in corporate EPS registered in 2015. Weak profits almost always mean weak stock market returns.

As long-time readers of this column know, I believe corporate earnings results and shifting expectations around future earnings are the biggest drivers of equity returns. If corporate earnings are expected to surge in the next twelve months, and the results end up being better-than-expected, then it doesn’t matter if the dollar is strengthening or weakening. So, if the dollar continues to strengthen as the Fed tapers and eventually tightens, it will only matter for equity markets if corporate earnings and expectations are falling at the same time. That’s not what we’re seeing now, but this will be a key factor to watch in 2022.


1 Wall Street Journal. October 4, 2021.

2 Fred Economic Data. November 1, 2021.

3 Fred Economic Data. November 1, 2021.

4 Fred Economic Data. November 1, 2021.


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