At first sight, the Internet seems to offer the perfect vehicle for the con
duct of market research. However, there are challenging methodological diff
iculties in using this medium, and there is much yet to be learned. This pa
per reviews the potentials and pitfalls involved. It then presents the resu
lts of a study of private trading over the Internet and analyses approaches
to the risks involved. Even a topic such as one involving a population of
e-mail users, which should be ideal for research using the Internet, presen
ts difficulties of sampling and self-selection that are difficult to overco
me.