

The point is that, because it’s a flat rate, you end up paying more the more money you have.
The rich dont spend much of their money on consumer goods. They spend most of their money on investments, financial services, etc.
So when you and I spend nearly 100% of our money on consumer goods, we are paying 25% of our income in taxes. But the richest among us, whose consumer spending amounts to 10% (or less) of their earnings, pays just 2.5% of their income on taxes.
Flat rate taxes on consumer spending are wildly regressive.
Beer and bread share a common ancestor: gruel. Put grain in water to soften. Works better if you also heat the mixture. Now you have a carb-rich slurry or paste in which bacteria have been killed off, suitable for staying alive.
Don’t eat it all right away. Let it sit around for a bit, and wild yeasts will grow in it first, before bacteria start colonizing it.
Pour off the liquid: that’s a primitive beer. Let the remaining mash dry out a bit; that’s a primitive bread.
Actual beer and actual bread are just evolutions along the same lines.