The Enduring Relevance of the Dollar Smile Framework

In the latest episode of Thoughts on the Market, Andrew Watrous, G10 FX strategist at Morgan Stanley, provides a comprehensive analysis of the "dollar smile" framework—a concept originally developed by Morgan Stanley in 2001. Despite recent skepticism regarding its efficacy in the current macroeconomic climate, Watrous argues that the framework remains a robust tool for understanding how the US dollar behaves under varying global growth scenarios.

Deconstructing the Dollar Smile

The dollar smile is a metaphorical curve representing the currency's performance relative to global economic conditions. According to Watrous, the curve is defined by three distinct phases:

• The Left Side (Safe Haven): When global growth is "concerningly weak," investors experience a "flight to safety," flocking to US assets. This dynamic causes the dollar to rise.
• The Right Side (US Outperformance): When US growth significantly outperforms the rest of the world, capital flows into the United States, further boosting the dollar's value.
• The Bottom (Synchronized Growth): In the middle of the curve, where global growth is "robust" and "synchronized," the dollar tends to weaken. During these periods, investors seek "riskier assets" and often utilize the dollar as a funding currency by borrowing in dollars to invest elsewhere.

Addressing the Skeptics: Is the Framework Broken?

Some market observers have suggested that the left side of the smile is no longer functional. Their arguments often posit that if the US itself is the source of a "growth shock"—such as through political uncertainty or trade wars—the dollar should not benefit. Additional concerns involve the rise in US interest rates and changes in the "structure of global asset holdings," which critics argue might prevent the typical dollar bid during growth scares.

However, Morgan Stanley refutes these challenges. By utilizing "economic surprise indices" to measure actual data against forecasts, the firm confirmed that the historical pattern holds: the dollar rises when growth is surprisingly weak, and it sees even greater appreciation when US growth outperforms while global growth underperforms.

Empirical Evidence and Recent Market Episodes

Watrous points to specific recent examples to validate the framework's persistence:

• Geopolitical Resilience: In June 2025, amidst spiked geopolitical tensions between Israel and Iran, the dollar "surged" as investors "fled to safety," proving the currency's role as a reliable haven.
• Clarifying the April 2025 Dip: While some noted that the dollar dipped in April 2025 following tariff announcements, Watrous clarifies that this was not a "breakdown of the smile." Rather, the decline was driven by "policy unpredictability" in the US, which caused investors to temporarily reduce exposure to US assets, distinct from a structural failure of the smile itself.

The Outlook for 2026

While the firm maintains that the framework is intact, the broader outlook for the dollar is one of structural softening. Watrous notes that the dollar dropped approximately 11% against other currencies in the first half of the year—the "biggest decline in more than 50 years"—effectively ending a "15-year bull cycle."

Looking ahead, Morgan Stanley anticipates that the dollar will "continue to weaken through 2026." This projected decline is predicated on the Federal Reserve cutting interest rates and the ongoing reality of "elevated" policy uncertainty.

Conclusion

Despite the expected downward trajectory for the dollar in the coming year, the core message remains clear: the dollar smile framework is not an obsolete relic of 2001. It remains a fundamental lens through which to view market volatility. As Watrous aptly summarizes, when markets "wobble," the US dollar will likely continue to "greet volatility with a smile," reinforcing its unique position as the cornerstone of the global financial system.