This assumes talent is geographically homogeneous. IMHO, Talent in top cities in the US is better than the one in the rest of the countries, and so it goes for other countries.
For top US firms, it may well be that there is a better pool for top talent, but not THAT much better. I believe it would be possible to do inferences from # of non-US citizen in FAANGs.
For top US firms, it may well be that there is a better pool for top talent, but not THAT much better. I believe it would be possible to do inferences from # of non-US citizen in FAANGs.