> Say the top 1% increase their proportion of wealth from 20% to 40% of the money supply. Since there's only a finite amount of stuff to buy (productivity), this means the rich can also buy a proportionally bigger amount of stuff.

yes, the money supply and real productivity are disconnected from each other, but it's hard to imagine such a huge change in control of the money supply over a period where real productivity is held constant.

> It's not entirely zero sum, some investments increase productivity and thus create actual wealth. Unfortunately investment in stocks and real estate don't increase productivity at all while rent-seeking only directs an ever increasing proportion of available wealth towards rich people.

if there are some investments that increase productivity, but they aren't stocks or real estate, what investments do increase productivity?