It wasn’t that long ago that we were experiencing a spectacular degree of dollar strength in 2014 and 2015—more than 23% appreciation in these two years, as measured by the ICE U.S. Dollar Index (DXY).1
The Dollar Became Extended vs. Purchasing Power Parity
U.S. Dollar Index Spot Level vs. U.S. Dollar Index Purchasing Power Parity Level
- Purchasing power parity (PPP) might be most popularized by its relation to what’s called the Big Mac Index. The gist of the Big Mac Index is that a ubiquitous product—the McDonald’s Big Mac—should cost just about the same, adjusting for exchange rates, in different countries. A tradable basket of goods should have the same cost, no matter the currency. The orange line represents an estimate of the appropriate PPP level for the U.S. dollar, using a basket of global currencies that approximate DXY’s exposures.
- Currency spot rates, however, do not take PPP and move in alignment as an exact science. Over the last 20 years, the DXY spot rate has been both considerably above and below PPP, punctuated by strong appreciation and strong depreciation.
- 2014’s upward spike in performance of the U.S. dollar was extreme, and it took DXY from a discount relative to PPP to a premium relative to PPP. While this premium still persists, it is more modest and brings into context some of the moves of 2016 and 2017—even in the face of divergent central bank policy.
Connecting Currency Movements with Relative Growth Cycles
While PPP is important, it is rare to see it take center stage. In today’s world, governments are searching for ways to grow faster. Developed markets have lots of debt, and faster growth allows for either the raising of greater revenues or more inflation, which allows for the paying down of debt with currency that is worth less over time.
There is a fairly strong explanatory relationship between the trajectory of U.S. growth versus the rest of the world along with the U.S. dollar’s real effective exchange rate against a basket of currencies.
Stronger Relative Growth Leads to Stronger Currency
Relative Growth Cycles and FX (1/31/1985–4/30/2018)
- Neither U.S. growth nor the dollar tend to stay at a constant level versus the rest of the world. As the world’s largest economy, the United States is nowhere near the fastest growing, and it is frequently growing at a slower rate than the rest of the world, as shown in the chart, which notably has a 40% to 50% exposure to much faster-growing emerging market countries.
- Notably, during periods of appreciation in the real effective exchange rate, the U.S. tends to increase its growth relative to the rest of the world. At the end of 2015, U.S. growth relative to the rest of the world peaked and stopped what had been a trend of U.S. growth acceleration relative to other countries. The real effective exchange rate responded in kind.
The Connection of Central Bank Activity & the Growth Cycle
Output Gap (% of potential output) from 3/31/1983–12/31/2017
- The output gap is a way to think about the effectiveness of a given economy at achieving a level closer to its potential output.
- The U.S. tends to accelerate first out of a recessionary period. Connecting to the prior chart and understanding that developed markets today are more interconnected than ever before, it is during this acceleration that the bulk of dollar strength is seen. Then, other economies begin to catch up with the U.S., thereby seeing their growth accelerate on a relative basis. The U.S. therefore tends to reach the point where its central bank is thinking about inflation first—and experiencing inflation first—before other central banks are taking action.
- The combination of the U.K., eurozone and Japan started displaying acceleration relative to the U.S., and this explains the dollar’s relative weakness in 2017.
Looking Forward—Outcomes for U.K., Eurozone and Japan Are by No Means Assured
In 2017, the U.K., eurozone and Japan had many positive economic surprises—in some cases, genuinely positive, while in others less decidedly negative. 2018’s outcomes are by no means assured, and recent growth momentum signs may be reversing yet again. While the dollar is not “cheap” on a PPP basis, it also not overly expensive, and there are a number of forces that can push it higher.
What Is the Investment Takeaway?
In many ways, the complexity of currency markets suggests one should not feel overconfident in their ability to forecast currency movements. This leaves many investors stuck in their status quo bias with legacy positions. We point out that the status quo of being unhedged relies on a weak dollar bet persisting, forever. Being unhedged implies a directional currency bet—whereas strategically hedging involves mitigating any directional bets.
WisdomTree suggests having a currency-hedging program to neutralize the risks that come with currency exposure. Hedging can be done either strategically to lower risk, 50% hedged to minimize regret or with a dynamic overlay strategy to add alpha. All are reasonable currency programs—what we question the most is being 100% unhedged all the time and the assumption of unrewarded risk that comes with it
1Source: Bloomberg, with data measured for the period 12/31/13–12/31/15.
2We’d like to thank Record Currency Management, a global thought leader on currencies, for analytical support in this blog series.
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