Earlier quoted context omitted.
The devil is in the details though. I’m sure a US capitalist and a French government bureaucrat have very different ideas as to what constitutes “enough money”.
If we fixed profit shifting, then the French bureaucrat could set a tax rate, and the US capitalist would be free to choose whether they wanted their company to do business in France, and thus the market would eventually find some equilibrium for us. Right now it doesn't matter what the French corporate tax rate is, because multinationals don't have to pay it.
If it's (2) wouldn't that just incentivize businesses to sell to France but not employ French people, and if it's (1) wouldn't corporations just offload the cost of that tax onto consumers so that good are just more expensive in France?