Maybe Karl Marx had a point? Sure, communist revolutions of the 20th century produced suboptimal results, but only because violent psychopaths were in power. We need democratic socialism. Maybe Bernie Sanders has right ideas.
Ultimately the more centralized the power the less efficient the system is. Markets are great because they push decision making down to the fringes, closer to where the ground truth is. With highly centralized systems there is a bottleneck both in getting information to the decision makers, but also in overwhelming those decision makers with too much detail and losing fidelity. The flipside is that markets are only e…
But what about the previous paragraph where you said
> markets are... mostly blind to externalities (pollution!)
What about the externalities from consumer goods? (And everything else we value via markets, which is nearly everything else)