Stuart Armstrong writes,
The employment market is a market, with the salary being the price. Why doesn’t this market clear? Why doesn’t the price (salary) simply adjust, and then everyone gets a job? It seemed profoundly mysterious that this didn’t happen.
Pointer from “Scott Alexander.”
I commend Armstrong for posing the issue and thinking through it. Everyone who studies economics needs to puzzle it out. However, my viewpoint differs from his.
To me, you have to distinguish real wages from nominal wages. For just a moment, I will play the macro game of treating the economy as a giant GDP factory with identical workers, so I will speak of “the” real wage and “the” nominal wage.
The simplest macro theory of unemployment is that it is due to money illusion. The real wage needs to be lower in order to clear the labor market, but workers will not accept lower nominal wages. Meanwhile, the price level is determined by something else (the money supply, say), so you can be stuck at the wrong real wage. The Keynesian/monetarist cure for this is a higher price level, at which workers are willing to accept the lower real wage that they would not accept previously. It’s the most coherent way to tell the macro story, but it is not very popular. Scott Sumner likes it. I think Bryan Caplan likes it. I think most modern Keynesian macro folks consider it to be too simple.
The theory of unemployment that Robert Solow taught when I was at MIT was from Edmund Malinvaud’s book, The Theory of Unemployment Reconsidered. It did not rely on money illusion. Instead, both wages and prices were sticky. If they both happened to be too high relative to another nominal variable (again, the money supply is a standard candidate), then the demand for goods will be low, and this will reduce the demand for labor. This was called a general disequilibrium model, because it shows how problems in one market can spill over into another market. So, in 2008 there is excess supply in the construction market, and as workers are laid off there they reduce their demand for consumer durable goods, and so you get layoffs there, and so on.
General disequilibrium never really caught on as a story. Instead economists went for the sort of stuff that Stan Fischer and Olivier Blanchard were pushing, which was representative-agent intertemporal optimization with some ad hoc rigidities thrown in. And if you do not know what that means, just suffice to say that Solow and I hated it then and hate it now, while Paul Krugman likes it when it’s used to support Keynesian policies. When it’s used to oppose Keynesian policies, he calls it Dark Age Macro.
The stickiness of “the” price and “the” wage are ad hoc rigidities in the Malinvaud model. To get from there to what I currently believe, you need to incorporate all sorts of other adjustment problems or coordination failures. Imagine the economy being run by a central planner. What does the central planner want to do with those laid-off construction workers, or with the 19-year-olds who took a few courses at community college and then dropped out, or with the 57-year old manufacturing worker whose job was just taken by a robot or by a factory worker in Vietnam?
Substitute for the central planner the set of all entrepreneurs in the economy. Well, it turns out that the entrepreneurs are, collectively, almost as bereft of ideas as the central planner. Meanwhile, the unemployed folks are not so desperate that they go around offering to wash dishes or empty bed pans or do yard work for $5 an hour. Instead, they subsist on savings and handouts from various sources until the set of entrepreneurs figures out something useful for them to do. That is what Tyler Cowen and I started calling the recalculation problem five years ago. It is what I mean when I say that the entrepreneurs have to discover new patterns of sustainable specialization and trade.
In the Malinvaud model, if you could “unstick” wages and prices, you would get out of general disequilibrium. In PSST, it’s probably better to keep prices and wages where they are, so that the existing sustainable patterns of specialization and trade don’t get lost. In order to raise employment, entrepreneurs will have to discover new patterns, and that is a time-consuming, trial-and-error process. Monkeying around with the money supply or the government deficit is not necessarily going to make the process go any faster.