At what point do we stop attributing an economy to a President's predecessor? If the economy crashed by the end of the year, would that be Obama's crashed economy or Trump's?
A few months ago, when the unemployment rate came out, I read tweets saying it's usually one full year before the predecessor's effect wears off. I don't know how true this is, but you are right that more or less, Trump has not done much when it comes to the economy.
Look at the stock market. The jump started in November 2016. Trump also cut regulations and the market expects him to cut taxes eventually, as well. If tax cuts appear to be falling through, expectations will get worse and growth will slow down.
