While classical exchange theorists excluded bargaining from the scope of th
eir theories, most contemporary theorists have done the opposite, concentra
ting exclusively on negotiated exchanges with binding agreements. We analyz
e how the form of social exchange-negotiated or reciprocal-affects the dist
ribution of power in exchange networks. These two forms of exchange differ
in fundamental ways that affect how actors use power and the Rinds of risk
and uncertainty they face. We predict that these basic differences will aff
ect the relation between the availability of alternative partners and actor
s' use of power, and will produce lower power use in reciprocal exchange th
an ia negotiated exchange. We test our predictions in a laboratory experime
nt. The results support the underlying logic of our theory, partially suppo
rt its specific predictions, and raise new questions about the importance o
f the different time perspectives required by negotiated and reciprocal exc
hange.