This paper addresses a little examined intersection between the proble
m loan literature and the bank efficiency literature. We employ Grange
r-causality techniques to test four hypotheses regarding the relations
hips among loan quality, cost efficiency, and bank capital. The data s
uggest that problem loans precede reductions in measured cost efficien
cy; that measured cost efficiency precedes reductions in problem loans
; and that reductions in capital at thinly capitalized banks precede i
ncreases in problem loans. Hence, cost efficiency may be an important
indicator of future problem loans and problem banks. Our results are a
mbiguous concerning whether or not researchers should control for prob
lem loans in efficiency estimation. (C) 1997 Elsevier Science B.V.