> Currently, Indians have the highest median income of any ethnic group in the United States. While there are cultural contributors to this trend, it’s probably mostly a result of an extremely powerful selection effect wherein only the very economically best and brightest out of the 1.4 billion people in India manage to immigrate to the US.

"economically best and brightest". That’s a google search that only shows this article.

Now consider the caste makeup. Two thumbs up from the author to the caste system I guess.