To the contrary, Trump understands economics quite well. It is the economist, so-called, who don't understand economics. If they did, they would be the ones bragging about being billionaires.
There’s a difference between understanding the bottom line and understanding the “invisible hand” of the free market economy, as well as disruption it can cause from time to time which in a free market are growing pains in preparation for economic growth to the next higher level of wealth creation.
I’m also not convinced Trump understands the intrinsic threat the $4 trillion mostly unconstitutional government is as a HUGE (YUGE) drain on our economy.