This paper tests implications of banking theory and legal theory for c
ross-country differences in banks' equity betas and returns. Banking t
heory predicts different risk exposures between transactional banks, f
ound in the United States, United Kingdom, Australia, and Canada, and
relationship banks, found in Japan, Germany, Switzerland, and the Neth
erlands. We find strong empirical support for banking theory's predict
ion of different risks and returns between transactional and relations
hip banks. Legal theory predicts that differences in banks' equity ris
ks depend on the nature of the legal system for protecting the interes
ts of outside investors. We find mixed evidence that banks' returns ma
y vary by the type of legal system.