Not quite. 54% of the 135M American workers have a retirement plan.[1] That's 73M out of the ~250M American adults. Maybe you can call that the middle class. But point taken. To be less pithy, these individual shareholders have little power to sway governance, particularly if their stock is held in a managed fund. The rich, connected shareholders steer things, and it's not always in the interests of the company in the long term.
The vast majority of Americans derive the lion’s share of their income over most of their lifetime from selling their labor, not from capital returns, whether from stock alone or any other combination of capital.
That is such a joke. What does "booming economy" really mean? Mostly the stock market, I think. And "low unemployment"? It's low because people who have given up looking aren't counted. And because it includes lots of short-term and poorly compensated jobs.
That's more thanks to the Fed than anything else, though their role is also pretty small. The truth is the president doesn't have the ability to affect the economy very much one way or the other.
Unemployment, economy, stock market, GDP - all have been on the exact same trajectory post the 2009 recession. We would have been exactly here even if a tree was the President. The only thing that got worse economically was the Federal deficit, which is a trillion dollars now.
"low inflation"
...
not if you include assets (stocks, houses, education, health[care], etc.) that are not included in the "official" inflation calculations.