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One interesting consequence is that if this became widespread it would likely further increase the incentive to move from poor countries to rich countries.
Another odd consequence: wars and major disasters can substantially increase GDP. There's the potential for some unfortunate feedback loops there.
It may have more benefits to tie it to Gross World Product. (This is no way means all governments would need to commit to it; it could still be done per-Government.)
Goodhart's law would also be a scary player, here, since GDP "just" measures flow and can easily be gamed. But any of that needs to be compared to what we have today, right? Which is nothing.
Another problem with using GDP as a measure for this is that GDP completely ignores very valuable activities that occur outside of the market, a point well-made in the FT recently: https://www.ft.com/content/b4a4e236-c084-11e7-9836-b25f8adaa111 …
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