Has U.S. stock outperformance come from fundamentals or currency and valuation gains?
Core argument: The S&P 500 has beaten the rest of developed market equities by a cumulative 150% over fifteen years, but about 80% of that outperformance came from dollar strength and expanding relative valuations rather than fundamentals.
The S&P 500 has outpaced the rest of developed market equities by a cumulative 150% in the past fifteen years. If we start the clock in December 2014 instead of December 2010, the U.S. fundamentally outperformed the rest of the developed markets by a smidge: an aggregate 3.8%. Fast-forward to December 2019, and the fundamental outperformance since then is nil. Exhibit 1 does not deliver a ringing endorsement of U.S. equities. About 80% of their outperformance came from sources of return that are unlikely to repeat: the dollar strengthening against almost every currency in the world and relative valuations expanding. The dollar is already very expensive, and the U.S. administration is pushing for trade and monetary policies that actively make it less attractive for foreigners to hold dollar assets. U.S. valuations are already somewhere between the 90th percentile on simple ratios like P/E and closer to their all-time records when contrasted with the opportunity cost of investing in other assets (like Treasuries). It pays to remember that higher valuations always beggar future returns, though U.S. stocks did deliver on fundamental returns [dividends, share repurchases, and organic growth].



