I'm not defending Trump. I'm "defending" supply side economic policies. Trump is enacting tariffs, which is the exact opposite of supply-side. As I said you have to let go of your obsession with Trump.
Tariffs are a tax. You welcome to call it a cost if you want, but everybody else calls it a tax. Google says it's a tax. I didn't check Wikipedia, but I'd bet it says tariffs are taxes too. Economists refer to tariffs as taxes. When the gov't collects money on a transaction, that's a tax. I'm not sure why you think tariffs aren't taxes.
So it's bad for the economy if Trump enacts tariffs and prices go up, but it's good if Trump increases corporate tax rates and prices go up? What if instead of a tariff, we went European with a VAT?
You totally miss characterized what happened under Reagan. In addition to tax cuts there were massive spending increases.
You also miss characterized the Clinton economy. The Clinton economy boomed because of the tech boom, NAFTA, GATT, the end of cold war and sustained low energy prices.
Musk is giving himself billions of dollars? I think you should expose this theft. CNN would be happy to report on that.