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Comma is the decimal separator in many countries (including Norway). ISO and several other standards bodies recommend space for digit grouping: 5 000 000.

Only if 'the rest of us' is located in one of the blue areas:

https://en.wikipedia.org/wiki/Decimal_mark#/media/File:Decim...

His point isn't about commas over periods, it is that "5000000" without any delimiters is hard to read.

Yes and i dont use Arabic numerals. Whats it in Roman?

To be fair, considering China and India are included, I think that's more than half the world population. China, India and the US make up more than 40% of the world population alone, apparently:

https://en.wikipedia.org/wiki/List_of_countries_and_dependen...

(The US is the 3rd most populous country by the Wikipedia hivemind's reckoning. Who knew?)

Sorry about that, I'll keep it in mind for the future :)