[genericuser]

That article does not seem to claim that point in it. Maybe I just missed it. But I checked all usages of high, population, city, and cities, so if the point is made in that article is is done so with different enough language to be difficult to find considering the article's length.

Edit: That all means I am calling bullshit on that being a citation for that fact (or 'fact' depending on your view of it).

[cozzyd]

The Manhattan Institute's mission is (I paraphrase) to make selfish rich people feel less guilty, so I would be wary of any claims made by the article.