That growth is coming from transitioning from a command economy to a market economy. Beside, China's population is not collapsing is it? I'd give real money if you guys could come up with pertinent examples.
I don't know --- one child would be quite below the replacement level --- so maybe it is collapsing. Otherwise I don't think population is exactly collapsing anywhere. I think the main factor is what type of people are reproducing --- if middle class working people are and the middle class is growing then things are getting better, if it's the dependent welfare class that's growing then things are getting worse --- just like with Mexico --- population growth is extremely high --- but their economy is worse than ever and they'll be facing some serious future problems because of the growing number of abandoned children.