> I believe at least at the early stage capitalism trickle down economics works.
What is the basis of your belief?
I hope you understand that there is no thing in economics called "trickle down economics" or "trickle-down theory". It was term invented by Will Rogers as a joke to mock tax reduction policies that benefit the rich. Conservative politicians and pundits adopted this non-existent theory meant to mock them and magically people started to believe that it's a real theory that exists.
Only evidence of tax cuts helping comes from tax cuts for the poor who spend the money and don't invest, thus increasing the economic activity.
https://www.journals.uchicago.edu/doi/abs/10.1086/701424 Trickle down has no evidence or theory to support it.
There is related real concept called supply-side economics, but it's also widely discredited by economists, including those who worked for Reagan like Mankiw. I think only handful of economists support it today.