The existing economic system makes the economy chaotic. A chaotic system is one in which all of the variables are interdependent: all affect and are affected by all others. At the same time, there is a political imperative to always be maximizing total output in order to maximize employment, total income, and the amount of taxes collected at current rates. That is the single biggest barrier to sustainability.

We need a transitional "phase shift" within this system. I found a way to do that.

The supply of money (as currency) would become an exogenous variable: it would influence all other variables, but would not be influenced by any other(s). In the paradigm I have developed the amount of the supply of money would be determined by demographics. It would be fully self-regulating (with built-in protections against inflation), making the economy stably self-regulating. There would be no unemployment or poverty at any level of total output. The paradigm could also be used to eliminate using taxes/public to fund all government, from central to local.

if curious: "Permanent 'Quantitative Easing'" (a "4 min read" with links for further reading, all of it here in Medium, but not behind the paywall)