Quote:
Originally Posted by yuriandrade
When we’re talking about megacities (above 10 million people), the 100 km radius makes sense almost everywhere. A city this size has a massive gravitational pull over 100 km or had urbanized most of the circle.
In the US, for example, the big 3 has more people on their official metro areas than in the 100 km radius.
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I'd say it's generally effective as a "sphere of influence" of a large city. People 100km from a city centre likely aren't visiting that centre daily for their jobs, but are likely going to make occasional trips into the city for entertainment, shopping, etc.
Europe's 3 "megacities" all have populations greater than Los Angeles within 100km of their cores, for example. Which actually surprises me quite a bit. I Always figured the big 2 American metros, other than Tokyo, were far and away the largest cities in the developed world.. Moscow, Paris, and London all have well over 16,000,000 people within 100km of their cores.