All of these metrics have serious shortcomings. I think the right approach is to look at them together, keeping in mind what each brings to the table, to get a holistic picture of an economy.

Also, keep an eye on net migration, because that's the best metric of revealed preferences.

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I agree with your first paragraph.

Net migration would be a far more useful metric in a borderless world. Borderless would mean no political barriers, no financial-migration barriers, no language barriers, and no cultural barriers…a largely impossible (and possibly undesirable) task. But the political and financial limitations to migration are quite possibly within reach in a world with open money/open communication in place

Totally agree. It's just another metric to keep an eye on.