Gregory Clark, A Farewell to Alms. See:
https://press.princeton.edu/books/paperback/9780691141282/a-...
Chapter 1:
The real advantage of a planned economy can be seen in the case of the USSR or China where they rapidly grew from a backwards agrarian feudal base into industrial powerhouses in the highest growth rates of the 20th century. As economist Richard Wolff says, they are the envy of the third world.
There's a monotonous consistency in the ability of numerous political-economic organisation systems to produce extreme poverty and misery. Almost as if those were exogenous to those systems.
Half full or half empty...
Of course, this isn't left 100% to the free market so the state has overall planned control of the economy and will intervene to preserve their interpretation of socialism ("socialism with Chinese characteristics").
Except the number of people in extreme poverty worldwide has decreased...