Greenspan dies at 100, leaving the Fed Put's future in doubt

Alan Greenspan's death at 100 revives debate over whether the Fed Put still protects investors.

The expectation that the Federal Reserve will rescue falling stock markets — known as the Fed Put — traces directly to Greenspan's response to the 1987 Black Monday crash, when the S&P 500 lost 20% in a single day. The Fed issued an emergency statement promising liquidity, cut interest rates and pressed banks to keep lending, preventing the crash from infecting the broader economy.

"According to what I knew on reliable terms, what Greenspan did is, he was on the phone that night calling around to the leading banks and telling them, 'I don't want any clearinghouse to fail. I don't want any brokerage firm to go under. You lend to the clearinghouses whatever you need, and we're going to back you,'" Lester Telser, the late University of Chicago economist, told an oral history project at the University of California, Berkeley.

The Fed repeated the playbook a decade later when the collapse of hedge fund Long-Term Capital Management threatened Wall Street, again cutting rates and pushing banks to coordinate a rescue. After the dot-com bubble burst in 2000, the Fed stopped raising rates and slashed borrowing costs in 2001. Each intervention reinforced the belief that the central bank would shield shareholders from their own excesses — a dynamic critics call moral hazard.

The Greenspan Put worked because inflation was low and stable, giving the Fed room to prioritize growth. The post-pandemic era has flipped that calculus. The S&P 500 fell 25% from January to October 2022, yet the Fed continued raising rates for another nine months as it fought inflation that had surged above 9%. Consumer prices have not been below the Fed's 2% target since February 2021, keeping the central bank focused on price stability rather than asset prices.

The 2022 Test That Changed the Calculus

The shift has left investors questioning whether the Fed Put still exists. In the 1987, 1998 and 2000 episodes, the Fed stepped in after equity declines of 20% or more. The 2022 experience suggests the threshold may now be higher. "If the next stock market downturn is severe enough to threaten the economy, and so lower inflation, I'd expect the Fed Put to make a rapid reappearance," James Mackintosh wrote in the Wall Street Journal. "But I doubt a mere 20% fall would be enough."

The last time the Fed faced a similar tension between inflation and financial stability was in 2018, when the S&P 500 fell 14% in the fourth quarter after the Fed raised rates. The central bank pivoted in early 2019, cutting rates three times. But inflation then was below target at about 1.5%, giving the Fed room to ease. Today, with inflation still above 2%, the Fed's flexibility is constrained.

What the Greenspan Put Means for Investors

For investors who grew accustomed to the Fed backstopping equities, the new regime implies higher risk premiums. If the central bank is no longer willing to rescue markets after a 20% decline, the cost of hedging tail risks rises. The next test will come when the next downturn arrives, forcing the Fed to choose between growth and price stability. The answer will determine whether the Greenspan Put survives its creator.

This article is for informational purposes only and does not constitute investment advice.