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> For all we know urban environments are 70% INTJ.

There are 16 categories, which means you'd expect about 6% in each if the test sorts evenly. It doesn't; in fact only between 2% and 3% of the population is INTJ. Unless one of the questions is literally "are you a tech worker", that's very conspicuous selectivity.

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On the other hand, a test with questions like 'are you a tech worker' might be a lot shorter and just as meaningful!

The test doesn't sort evenly. One of the most popular online test sites says in one of their descriptions - I forget which one - that "this is the rarest type with only x% of the population."

I had a female friend who was an INTJ, and told me that it was very rare among women. Being very, INTJ, she was referencing some rigorous statistics.

Yes, I mentioned in the next line that it doesn't sort evenly, and INTJ is particularly a minority.

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