What I learned from COVID

Authored by

Owen A. Lamont, Ph.D.

Senior Vice President, Portfolio Manager, Research

The U.S. stock market continues to defy expectations, reaching new heights. These gains come despite extreme geopolitical uncertainty and a possible breakdown of the global postwar economic order. How can the U.S. stock market be doing so well when the U.S. economic outlook seems so uncertain?

This stock market exuberance has confounded market analysts. Consider these plaintive questions:

  • Rogé Karma, The Atlantic: “Does the Stock Market Know Something We Don’t?”[1]
  • Spencer Jakab, The Wall Street Journal: “Why Are Stocks Up? Nobody Knows”[2]
  • Jeff Sommer, The New York Times: “How Long Can This Uncanny Stock Market Prosper?”[3]
  • Paul Krugman, Substack: “Policy has gone mad; why aren’t stocks down?”[4]

Back in June 2020, I felt the same way about the U.S. stock market. I thought the market had underreacted to COVID. But I was wrong, not about COVID itself (which indeed resulted in many adverse consequences), but about the stock market and corporate profits.

In case you've forgotten, here’s what the world looked like in June 2020. We had the medical situation of 1918, the unemployment situation of 1931, and the financial stability situation of 2008. Sounds bad to me! And yet, by June 2020, the market was actually up for the year, part of a monster rally that culminated in the speculative bubble of 2021.

COVID was a bad thing that adversely impacted many aspects of American life. You may think that COVID itself was bad, or maybe you think that the main problem was the reaction to COVID, but either way, bad things happened. But it turns out that these bad things did not greatly decrease the corporate profits of publicly traded companies or the desire of market participants to invest in those companies.

So what’s the lesson of COVID? Simply this: the stock market is not the economy (TSMINTE). The level of stock prices reflects the views of market participants about currently existing stocks; it does not reflect America’s economy, happiness, medical status, moral virtue, democratic norms, or national greatness, except insofar as these variables impact the views of market participants about currently existing stocks.

Let’s consider Krugman’s question: “Policy has gone mad; why aren’t stocks down?” Without endorsing Krugman’s views, I want to consider the abstract proposition that an insane policy would necessarily hurt stock prices. I don’t think so. An insane policy would only hurt stock prices if it is perceived as hurting currently listed companies.

Let’s take a hypothetical scenario of an obviously insane policy. In the 1971 movie Bananas, the ruler of the fictional nation of San Marcos announces the following policy:

… all citizens will be required to change their underwear every half-hour. Underwear will be worn on the outside so we can check.

Let’s suppose that in the U.S. elections of 2028, the newly formed Underwear Party sweeps into power on this platform (just to be clear, in this scenario the Underwear Party is unaffiliated with any existing political movement and is not meant to represent either the Democratic or Republican Party). I hope we can all agree that the proposed policy is undesirable and would hurt the U.S. economy, among other things.

But would this policy drive down stock prices? I’m not sure. The policy would surely boost the share prices of underwear manufacturers. Further, the government would need to purchase systems to monitor compliance, perhaps benefiting firms like current market darling Palantir.[5] Perhaps underwear would become the next crypto, with “underwear Treasury” stocks driven higher by purchases from the U.S. “strategic underwear reserve.” Who knows?

And, at least in the short run, it doesn’t actually matter whether the policy will lower corporate profits, it matters whether market participants think the policy will lower corporate profits. Since the Underwear Party won the election in this scenario, there must be many pro-Underwear investors feeling optimistic. Nobody voted for COVID, but it arrived anyway and ended up boosting stock prices. An equally destructive policy supported by many voters could surely also boost stock prices.

I’m not saying that the U.S. stock market is currently a screaming buy. Perhaps the skeptics are correct and the market is like Wile E. Coyote looking down into the abyss. That’s what I thought in 2020, but I was mistaken. The market was not Wile E. Coyote. The market was the Road Runner, who paused briefly, looked at COVID, and then sped away. Meep meep.

It’s not the economy, stupid. It’s the stock market, and it does its own thing.



[5] References to this and other companies should not be interpreted as recommendations to buy or sell specific securities. Acadian and/or the author of this post may hold positions in one or more securities associated with these companies.

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About the Author

Owen Lamont Acadian Asset Management

Owen A. Lamont, Ph.D.

Senior Vice President, Portfolio Manager, Research
Owen joined the Acadian investment team in 2023. In addition to more than 20 years of experience in asset management as a researcher and portfolio manager, Owen has been a member of the faculty at Harvard University, Princeton University, The University of Chicago Graduate School of Business, and Yale School of Management. His professional and academic focus is behavioral finance, and he has published papers on short selling, stock returns, and investor behavior in leading academic journals, and he has testified before the U.S. House of Representatives and the U.S. Senate. Owen earned a Ph.D. in economics from the Massachusetts Institute of Technology and a B.A. in economics and government from Oberlin College.