CONCORD, N.H. (AP) — A half century after Elvis Presley had a hit with “Return to Sender,” a Dartmouth College professor and three other economists have used the same idea to rate the efficiency of the world’s governments.

Rafael LaPorta and three economists at other universities mailed letters to nonexistent businesses in 159 countries — two letters to each country’s five biggest cities — and waited a year to see which were sent back to the college’s Tuck School of Business in Hanover.