For a half-century Martin Feldstein was everywhere you looked in American economics. He was an astoundingly prolific columnist, sometimes churning out several a week, for several newspapers, on the big economic stories of the day. He was a fixture at conferences and seminars and the teacher, for two decades, of Harvard University’s introductory economics course. He served presidents of both parties. In short Mr Feldstein, who died on June 11th aged 79, was an American economic institution.