First Author:   Julia Paxton Ohio University paxton@ohio.edu   329 Bentley Annex, Dept. of Economics, Ohio University Athens, 45701, USA   740-593-2042(Phone) 740-593-2042(Fax) http://oak.cats.ohiou.edu/~paxton/ Second Author: Fan Zhuo Boston University zhuo@bu.edu   Boston University, Boston University Boston, 02215, USA