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SpokenTruth said:
JRPGfan said:

The study mentioned "the 5 major cities"
If you google population of Sao Paulo, you get a answear saying 12,18.
I did the same for the 4 other major cities.
Which was how I arrived at 23m.

Yeah, that's municipal population. It's like saying San Francisco and Indianapolis are the same population (881k and 876k respectively). Yet their metro populations are 7.6 million and 2.0 million.

Well to me they are.

I see no reason to count the population of random cities that have nothing to do with one another, other than being somewhat in the vicinity and then attribute them to the biggest city in that area (which in this case would be San Jose and not San Francisco). Call it the San Francisco Bay Area and everything is fine.

Cities are legal entities with explicit limits, metropolitan areas are just a concept and can change depending on the definition at any given time.