It's a nice theory. History shows it to be as impracticable as it's "opposite" --communism.
We've been largely capitalistic for a while, and it's been quite practical, more than practical, beneficial. Or is our propensity for Nobel prizes just a fluke
American Leadership in Science, Measured in Nobel Prizes [Infographic]
Sorry world that our capitalism has raised the standard of living for all of you, and fed the globe. But I guess it isn't practical, because there are big corps not playing by the rules because our politicians let them. But blame the baby, not the bath water.