Using data from the National Science Foundation, the following Institutions have the highest percentage of graduates who go on to earn a Ph.D. in economics.
Swarthmore
Williams
Reed
Macalester
Carleton
Amherst
Grinnell
Wellesley
Pomona
Wesleyan
Caltech
Centre
Princeton
Whitman
Davidson
Knox
Haverford
Ohio Wesleyan
MIT
Kalamazoo
Source College Transitions