Research

The US Dollar Remains Strong

Reflecting Solid US Relative Long-Term Growth Prospects

Kurt Winkelmann, Raghu Suryanarayanan, Ferenc Szalai

The US dollar appreciated 14% year-to-date against major world currencies (annualized, in inflation-adjusted and trade-weighted terms). This scale of appreciation has not been witnessed in the last 22 years - the US dollar even reached parity with the Euro. Market commentaries have been quick to emphasise potential risks to financial and economic instability posed by a surging, strong greenback. Of course, inflation was tagged as a likely culprit. However, before jumping to hasty conclusions, investors should be well advised to examine the long-term, macro sources of currency trends. According to our models, the continued appreciation of the US dollar was driven by the relative increase in US long-term real economic growth expectations and relative decrease in long-term growth uncertainty compared to its major trade partners (including China). Going forward, the strength of the US dollar and global financial stability will continue to depend on US relative real economic growth prospects.

Exhibit 1 - USD Spot Exchange Rate Relative To Major Currencies

USD Spot Exchange Rate Relative To Major Currencies
Source: Refinitiv

Let's drill down into the sources of recent trends in currency markets in sequence. Exhibit 1 depicts the evolutions, from January 2021 through October 2022, of USD spot and 3-month forward exchange rates against the British pound (GBP) and the euro, and the Japanese yen spot and 3-month forward rates against the USD. According to the Exhibit, the relative appreciation of the USD against these major currencies was already under way in 2021, but became particularly pronounced since the start of this year. Year-to-date, the US dollar appreciated about 16% against the pound sterling, 13% against the euro - reaching parity - and 27% against the yen.

Exhibit 2 - Forward And Future Spot Exchange Rates

Forward And Future Spot Exchange Rates
Source: Navega Strategies LLC, Refinitiv

To make sense of the dramatic scale of these fluctuations, it is reasonable to ask ourselves how much of the change in spot rates had already been priced in currency forward markets? According to Exhibit 1, the 3-month forward rates have not been signalling future declines in spot rates, at least over the 3-month horizon. In fact, the USD/GBP, USD/EUR, and USD/JPY forward exchange rates have been declining in tandem with spot rates, at a slightly slower pace.

Exhibit 2 corroborates these observations, depicting the evolution of the spread between the spot and the lagged forward exchange rates (3-month lagged, 3-month forward) for the same currency pairs. For the most part and especially since February 2022, forward exchange rates have remained higher than the subsequent realised spot rates. In addition, Exhibit 2 shows that since February 2022, currency forward markets have been failing to anticipate (on a continued-basis) the scale of the changes in cross-country interest rate spreads.

Taken together, Exhibit 1 and Exhibit 2 indicate that the bulk (nearly 100%, on average) of the (continued) year-to-date appreciation of the US dollar can be attributed to unanticipated changes in cross-country interest rates differentials.

Exhibit 3 - Long-Term Real Yield, Real Growth, and Growth Uncertainty Spreads

Long-Term Real Yield, Real Growth, and Growth Uncertainty Spreads
Source: Navega Strategies LLC

The next question, then, for investors, is what are the sources of the changes in interest rate spread expectations (US yields relative to the rest of the world)? To address this issue, our models suggest that investors are well advised to focus on the long-term, macro sources. We first recall the conclusions from our previous paper that the recent increases in nominal government bond yields (in each country) were primarily driven by increases in real (inflation-adjusted) yields - not inflation. Thus, safely abstracting from inflation, Exhibit 3 shows our model-implied long-term yield spreads for UK, Euro area, Japan and China 10-year (constant maturity) inflation-linked government bonds relative to the US. According to the Exhibit, for each country, year-to-date long-term expectations of real yields decreased in relation to the US. Moreover, according to our models, real yields are driven by long-term growth and growth uncertainty. In turn, as shown in Exhibit 3, these relative decreases in real yield expectations can be traced to corresponding relative decreases in long-term real GDP growth expectations in each country, and with the exception of Japan, relative increases in long-term growth uncertainty.

Exhibit 4 - Long-Term US Growth Prospects Relative To Rest Of The World

Long-Term US Growth Prospects Relative To Rest Of The World
Source: Navega Strategies LLC

In other words, the continued year-to-date strengthening of the US dollar is primarily driven by expectations of improved US real economic growth prospects relative the rest of the world (i.e. higher long-term growth with lower growth uncertainty). Digging deeper, our models also suggest that these improved US relative growth prospects have been driven by expectations of relatively higher total factor productivity (TFP) growth in the US. This point is further depicted in Exhibit 4. The Exhibit shows the evolution since March 2021 of the probability of US long-term real GDP growth exceeding the rest of the world long-term growth. According to the Exhibit, since the start of the year, the probability has increased from about 60% to 67%. As discussed in our previous paper, high probability values can be tied to the privileged status of US dollar denominated assets. A dominant US dollar could indeed be a source of global financial instability if relative US growth prospects are expected to significantly deteriorate, on a continued basis.

Going forward, long-term investors concerned with the future direction of the US dollar are well advised to envision alternative scenarios of long-term drivers of US real economic growth and growth uncertainty relative to major economies, and trace these alternative scenarios' impact on global real economic growth, inflation, asset and currency returns in a systematic fashion.

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