That's not "trickle down" economics, which is not actually a real thing at all. That's a nonsensical political term that the Democrats seized upon during Reagan's "supply side" economic policy; which has beginnings much earlier than Reagan, and likely older than Jean-Baptiste Say's formulation.
There isn't an idea that alone "capital drives growth," that's an idea that Keynes came up with by misreading Jean-Baptiste Say. Paraphrasing him to say that "supply creates its own demand," which we all know is nonsensical, but that's not what Jean-Baptiste Say was saying. The idea is far more complicated than your simple explanation offers, though I sympathize with your view (though, at least the second paragraph is almost entirely wrong), it is narrow in its scope to the study of economics.
There isn't an idea that alone "capital drives growth," that's an idea that Keynes came up with by misreading Jean-Baptiste Say. Paraphrasing him to say that "supply creates its own demand," which we all know is nonsensical, but that's not what Jean-Baptiste Say was saying. The idea is far more complicated than your simple explanation offers, though I sympathize with your view (though, at least the second paragraph is almost entirely wrong), it is narrow in its scope to the study of economics.