What is the dollar value of U.S. citizenship?

Neil Munro writes to me with a question:

…[what is] the dollar value of U.S. citizenship, because of its financial, security, status and other benefits for an immigrant form China or India?

Do you know of people who have tried to calculate the value? Net-present value, I’d guess.

There is the famous paper by Michael Clemens, but I don’t think it calculates such a number straight up.  How about the lead Sumption link here?  Do any of you know the best answer?