Why isn't china collapsing !? Simple, it has to be because their people are not free and the communist party decides that the economy can't collapse.
Also it's economy has market but it's not commercial ? And that means it can't crash ? But also other countries shouldn't implement this because its totalitarian/USSR/it's gonna fail ?
According to all known laws of economics, there is no way China wouldn't collapse. Its SOE's profits are too small to get its fat little market off the ground. China, of course, doesn't collapse anyway because vulgar economics is a scam made up by liberal academics who didn't want to deal with the unavoidable anti-capitalist conclusions that come with understanding how capitalism works.