The Chinese ghost cities meme is overplayed. They're almost all located in the far western parts of the country. And they're usually not so much 'cities' as massive suburbs.
Comparing Toronto to a city like Shanghai is a little pointless. There are roughly 300m people in China who are expected to move to cities like Shanghai. And of the hundreds of millions of people currently living in cities, more than a third live in units lacking things like a kitchen or plumbing; as incomes rise those people will demand bigger units with mod-cons, putting still more pressure.
This WSJ article neatly summarizes the challenge:
I know China's authoritarianism and corruption result in the occasional suburb being built which ends up empty, but a handful of empty subdivisions hardly undermines the sheer amount of construction that will be needed.
There really isn't any comparison between the Shanghais and us. We face totally different circumstances.
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