This research tests competing predictions about the effectiveness of c
oercive strategies in social exchange. Both the classical exchange the
ories and most bargaining theories argue that the actual use of punish
ment in exchange relations provokes hostility and retaliation, and lea
ds to a decrease rather than an increase in mutually rewarding exchang
e. I argue instead that more frequent use of contingent punishment wou
ld increase the effectiveness of punishment power. Although the motiva
tion to minimize loss constrains the use of punishment, that motivatio
n should make it highly effective when used. An experiment tested thes
e predictions, using computer-simulated actors who were programmed to
employ varying levels of contingent punishment, under different struct
ures of punishment power, against a partner with a reward power advant
age. In support of my predictions, more frequent punishment for nonexc
hange increased the partner's reward exchange without increasing retal
iation or negative affect. Punishment that was both strong and consist
ent produced the highest frequency of reward exchange and the least ne
gative affect toward the partner.