Scott Alexander has a great article on the problems with Trump's approach to economics. I want to begin, though, with an analogy he uses at the end because it is the best single framework I have seen about understanding Trump's appeal:
Suppose you’re a hypercompetent billionaire in a decaying city, and you want to do something about the crime problem. What’s your best option? Maybe you could to donate money to law-enforcement, or after-school programs for at-risk teens, or urban renewal. Or you could urge your company full of engineering geniuses to invent new police tactics and better security systems. Or you could use your influence as a beloved celebrity to petition the government to pass laws which improve efficiency of the justice system.
Bruce Wayne decided to dress up in a bat costume and personally punch criminals. And we love him for it.
I worry that Trump’s plan for his administration is to dress up in a President costume and personally punch people we don’t like, while leaving policy to rot. And I worry it’s going to work.
Basically, Trump is acting like a small state governor, focusing his economic efforts on getting the Apple factory to come to town
So based on these two strategies, we are in for four years of sham Trump victories which look really convincing on a first glance. Every couple of weeks, until it gets boring, another company is going to say Trump convinced them to keep jobs in the United States. The total number of jobs saved this way will never be more than a tiny fraction of the jobs that could be saved by (eg) good economic policy, but nobody knows anything about economic policy and Trump will make sure everybody hears about Ford keeping jobs in the US. Every one of these victories will actively make the world worse, in the sense that these big companies will get taxpayer subsidies or favors they can call in later to distort government priorities, but nobody’s going to notice these either.
It seems appropriate to end this with a bit of Bastiat:
In the economic sphere an act, a habit, an institution, a law produces not only one effect, but a series of effects. Of these effects, the first alone is immediate; it appears simultaneously with its cause; it is seen. The other effects emerge only subsequently; they are not seen; we are fortunate if we foresee them.
There is only one difference between a bad economist and a good one: the bad economist confines himself to the visible effect; the good economist takes into account both the effect that can be seen and those effects that must be foreseen.
Yet this difference is tremendous; for it almost always happens that when the immediate consequence is favorable, the later consequences are disastrous, and vice versa. Whence it follows that the bad economist pursues a small present good that will be followed by a great evil to come, while the good economist pursues a great good to come, at the risk of a small present evil.