It is often claimed that e-commerce has created a more competitive environm
ent by encouraging the entry of new online firms and by enabling buyers to
search easily for the lowest prices. The limited evidence that exists paint
s a mixed picture. Many online markets are advertising- and technology-inte
nsive, creating a tendency towards growing concentration. Price search is i
mperfect and firms can dampen price competition by increasing product heter
ogeneity and switching costs. In many sectors, online firms may come to acq
uire some market power. We look at the forms of pricing that are likely to
emerge in such markets, including the greater use of price discrimination a
nd auction-like trading arrangements.