Research in marketing includes many examples of consumers helping othe
r consumers. However; most research has studied helping behavior from
the recipients' perspective by examining the use of personal sources o
f information. Consequently, very little is known about the prevalence
of market helping or why market helpers provide assistance. The autho
rs examine the incidence of a variety of everyday market helping activ
ities and identify a few key antecedents of market helping behavior Th
e results of a study of 302 heads of household confirm significant rel
ationships between market helping and two hypothesized predictors: gen
eral altruism and marketplace involvement. The market maven construct
is shown to mediate completely the relationship of these predictors wi
th market helping behavior The authors discuss the implications of the
results for public policymakers and consumer welfare.