A question has come up repeatedly over the past month, as markets reacted to the war in Iran and the associated spike in oil prices. The expectation, rooted in decades of experience, is straightforward: stocks fall, and defensive assets should step in to cushion the blow. This time, it didn’t work that way.
Global stocks fell by -6.1 percent, as expected. The S&P 500 fell a little less, -5.0 percent. But bonds, considered the primary counterweight to stocks and ballast to a portfolio, offered little protection, with a negative total return in March of -1.7 percent.
Gold, often viewed as a crisis hedge, fell even more than stocks and bonds, losing -11.0 percent. Even more confusing, Bitcoin rallied for a period, while a dedicated tail-risk strategy generated gains during the selloff only to give them back almost immediately when markets rebounded sharply at month-end.
At first glance, it looks like the traditional playbook failed. But that framing misses something important. The issue is not that safe havens stopped working. It is that there is no such thing as a universal safe haven to begin with.
Different shocks produce different market responses. This particular episode was not a classic deflationary panic like 2008 or the early days of the pandemic. It was an inflation-linked shock. Oil prices surged, inflation expectations moved higher, and the market quickly adjusted its view of Federal Reserve policy from two cuts to no cuts. That works against bonds.
Gold’s behavior is also less surprising when viewed through that lens. It tends to respond more to real interest rates than to headlines. When inflation expectations rise, but nominal yields rise faster, gold can struggle, even in the face of geopolitical stress.
Plus, gold benefited from incredible positive momentum for the last few years, and a lot of those investors no doubt bailed when the price action turned negative.
Even the partial “successes” tell a more complicated story. Energy stocks performed well, but only because the shock was directly tied to oil. Bitcoin’s rally was brief and inconsistent, reinforcing that an asset capable of large, rapid drawdowns cannot serve as a reliable hedge.
And tail-risk strategies, while effective in sharp declines, are highly path-dependent. They require both the right event and the right timing, and they impose a cost when markets stabilize or reverse (I wrote more about tail risk strategies here).
The broader lesson is that diversification is not about finding an asset that is always safe. It is about combining exposures that respond differently to different risks, knowing that no single defense will work in all environments, especially when your time horizon is just one month.
There is no magic bullet. There is only a portfolio built to withstand a range of outcomes, and the discipline to stick with it when none of the individual pieces are behaving as hoped.
In that sense, time remains the closest thing to a cure. Not because it eliminates risk, but because it allows the underlying return of productive assets to assert itself—what Buffett described as markets being a weighing machine in the long run. But even that only works if the portfolio is structured to survive the short runs that make up the long run, and if the investor can endure them.
Our job is not only to make optimal investment decisions, but to ensure that each client can live with their asset allocation. In the end, the optimal portfolio is the one you can stick with.
