Important social benefits of the market system are predicated on the assump
tion that consumers can effectively pursue their interest in the marketplac
e. Cause for concern exists to the extent that high consumption expenditure
s lead to relatively low levels of personal savings in the U.S. To the exte
nt that they do, in fact, over spend, consumers appear to deviate from econ
omic assumptions of rationality. This paper examines four conceptions of ra
tionality (two variants of rational choice theory, institutionalism, and on
e derived from economic sociology), with a view to evaluating implications
for consumer sovereignty under each. By explicitly accounting for differenc
es among individuals, economic sociology appears to offer more realistic po
licy solutions.