And you make the mistake most novices do on this topic.
While it is certain that no POTUS, has ultimate control over the markets and economy it is FOOLISH to deny their impact.
There is no denying that if American gov'ts did not focus on rebuilding the country in the Reconstruction Era, and just left it all to the Markets to sort out, that the types of nationwide prosperity that you saw all across America was due in large part to that governmental focus and effort.
The Golden Era of the US, starting in the 1950's where each successive government, whether Republican or Democrat was building infrastructure, raising Minimum Wage, and making massive investments to benefit the middle class (home ownership, etc) also massively impacted the Nation over all.
I know Magats are desperate to rewrite and deny that history but when the gov't invests in roads, ports, high speed internet, and other infrastructure, that is a Competitive advantage that drives higher profits for corporations and fosters more start ups and more companies to set up in America.
When government chooses to help the Middle class more than the Oligarch class, that frees up capital for the MC, which is the main driver of discretionary spending and thus consumer demand and thus increased profits and a better business climate.
YOur denial of this is just empty oligarch driven, PAID FOR talking points as to why all the benefits should flow to them directly and they can let trickle down what they want.