Not enough, especially since everything is business expense for them.
This blind kind of tax also has horrible impact on the production of goods with high added value.
Money changes hands so it's taxed with a purchase tax as a general rule.
> it will become proportional. What is still not very good.
Progressive tax currently is just a theory. Rich actually pay regressive tax. I'd take proprtional tax over ostensibly progressive tax but in reality regressive tax any day.
That's called a "transaction tax". It has lots of well known issues that are incredibly hard to remedy.