First, consider the relatively optimistic view: Covid-19 will have effects akin to what economists call a seasonal business cycle — which is to say, it will be over quickly and without much lasting damage.
. . .This less sanguine option might look like this: The Chinese economic slowdown leads to a permanent loss of momentum and a global recession. At the same time, with Lombardy closed down, the Italian government defaults, but the European Union is unable to resolve the matter (and the associated bank failures) in a timely and resolute manner. Governments vacillate between policies that make it easier for people to stay at home to limit the spread of the disease and policies designed to get them back in the workplace.
The U.S. would be caught up in the general loss of confidence, as well as the contagion from European banks. . .
Let’s distinguish primary effects from secondary effects, short term and long term.
Primary effects are reductions in activity in certain industries that are a pretty direct result of the virus crisis. Secondary effects would be reduction in activity that take place because people who lose their livelihoods in a directly-affected industry at some point will have to cut back on purchases, and that will affect industries that otherwise you might think would escape problems.
The airlines take a short-term hit from a primary effect. Conferences and other events are being canceled, governments are making it harder to fly into or out of certain countries, and many of us are questioning the wisdom of taking discretionary trips. But at some point air travel will get back to normal.
Cruise ships would seem likely to take a long-term hit from a primary effect. My guess is that some of the fifty-somethings who have watched this crisis unfold have sworn off ever going on a big cruise ship when they reach retirement age, so I would lower my long-term estimates for demand in that industry (and presumably the short-term demand falls of a cliff).
Will the hit to convention traffic be short-term or long-term? What if video conferencing proves its effectiveness? Corporations might decide to save on travel expenses long after the virus scare is over.
Also, there are primary effects that come from disruptions to the international production system, commonly referred to as the supply chain. Some of these are merely short term. But long term, firms will be thinking about building in some redundancy or reducing the use of overseas suppliers. If China no longer needs to build manufacturing facilities, then they do not need to import any materials from the U.S. to build them.
Conventional “aggregate demand” policies would seem to me to be useless for dealing with primary effects. And it’s possible that the secondary effects will not be so severe. So the economists who are eager to flap their gums about what the Fed should be doing might instead want to just hold off for a while.
If there are large secondary effects, they probably will operate through the banking and financial sectors. Banks and shadow banks are often highly levered, meaning that a small adverse development can make a firm go bankrupt. And financial institutions are often intertwined, so that one bankruptcy can lead to another. As the saying goes, when the tide goes out, you find out who is swimming naked.
Perhaps governments have to be included as being among the highly levered financial institutions. Tyler mentions the government of Italy, which seems to be having considerable difficulty with the virus and is in a precarious financial situation.
When financial institutions are worried about their own survival, they are less likely to help the firms that are suffering from short-term primary effects to ride out the storm. So an airline that could still be viable if it could get some loans to tide it over might instead have to declare bankruptcy.
The specific nature of the primary effects argues against thinking that conventional fiscal or monetary stimulus will work. Instead, such policies strike me as equivalent to pouring gasoline all over a car in the hope that some of it seeps into the fuel tank.
In theory, what you want is precisely targeted support, aimed at keeping alive the firms that deserve to survive short-term effects. But what you are likely to get instead are policies that mostly favor firms that do not need help or other firms that deserve to fail.