I wrote most of this memo over this past weekend, on the heels of the tumultuous seven-day correction. But I couldn’t get it out on Monday, and that day the S&P 500 rallied by 4.5%, or 135 points, for the biggest point gain in its history. I just can’t update it daily to take into account every rise or fall (or rate cut). And my real goal – as usual – is to suggest how to think about developments, not to say “buy” or “sell.” So please read this memo as of Sunday afternoon – whatever the markets have done since – and let me show how I assess the recent events.


I last used this memo title on September 19, 2008, two days after Lehman Brothers’ bankruptcy filing. This is certainly an appropriate time to recycle it.

Over the last few weeks, I’ve been asked repeatedly for my view of the coronavirus and its implications for the markets. I’ve had a ready answer, thanks to something from my January memo, You Bet! As you may remember, I drew heavily on quotations from Annie Duke’s book on decision making, Thinking in Bets. The one that stayed with me most – and that I’ve used a lot since the memo was published on January 13 – is this one:

An expert in any field will have an advantage over a rookie. But neither the veteran nor the rookie can be sure what the next flip will look like. The veteran will just have a better guess. (Emphasis added)

In other words, if I said anything about the coronavirus, it would be nothing but a guess.

I’ve written in the past about my reaction when people in China ask for my view of their country’s future. “You live there,” I say. “I don’t. Why are you asking me?” Not only am I not an expert on China, but I firmly believe the future of a country isn’t subject to prediction, especially one that operates under a system that’s unique. I furnish my opinion of China’s future, but I hasten to point out that it’s nothing but a hunch. People may ask me for my opinion because they think I’m intelligent, think I’ve been a successful investor, or know I’ve lived through a lot of history. But none of that should be confused with expertise on subjects of every kind.

And that leads me back to the coronavirus. No one knows much about it, since this is its first appearance. As Harvard epidemiologist Marc Lipsitch said on a podcast on the subject, there are (a) facts, (b) informed extrapolations from analogies to other viruses and (c) opinion or speculation. The scientists are trying to make informed inferences. Thus far, I don’t think there’s enough data regarding the coronavirus to enable them to turn those inferences into facts. And anything a non-scientist says is highly likely to be a guess.

So, overall, there are facts, inferences and guesses. It’s always essential to know which you’re dealing with. As for the virus, I don’t think anybody knows the answers to the following questions:

I want to stress that the purpose of the above discussion isn’t to give answers or to appear to be complete or authoritative. If anything, it’s to indicate the degree of uncertainty. If it’s true, as I think, that these things are currently unknown and unknowable, then clearly there can be no such thing as a reliable statement regarding the implications of the virus.

The Economic Impact

In the early days of the disease, when the coronavirus was something that was happening “over there,” the effects likewise were mostly second-hand: