Okay, but in this case a better assumption seems to be, the stock market is a function of the economy and political interventions. Or would you suggest this function does not depend on the economy at all?
Operationally speaking, the market moves based on the actions of market participants and thus the primary intellectual challenge is predicting those actions. Since currently the Federal Reserve working in concert with the US Treasury is an active market participant with unlimited capitalization that is telegraphing its moves, that is what's moving the market. Literally nobody trades on the reality that thousands of small businesses are in danger of going bust. Personally I think it's awful, but I don't have the capital to fix it.