It so happens that I happened to stumble upon a way to 'fix' "capitalism."
It is at bottom a different way of supplying the economy (any existing economy) with money. It would eliminate unemployment and poverty without taking anything from anybody. The same process could be used to fund government (at all levels, from now on, at the current per capita level of total government spending), eliminating taxes and public debt. It would enhance sustainability, even without more regulations or any changes in people's behavior.
Those outcomes were completely unanticipated when I first had the idea of possibly using a "democratically distributed income" to supply the economy with money.
"For Crying Out Loud, Accept That A Solution Actually Exists" (a "3 min read" — including options for further reading — here in Medium.