This paper compares experimentation about product differentiation in a line
ar setting under four market structures: quantity-setting and price-setting
monopoly, Cournot and Bertrand duopoly. Quantity-setting firms always expe
riment by raising their quantities and the monopolist experiments relativel
y more than the duopolists. A price-setting monopolist does not experiment.
The value of information to Bertrand duopolists may be positive or negativ
e depending on the degree of product differentiation. When information is v
aluable, price-setting duopolists experiment by lowering prices. A numerica
l example indicates that the intensity of experimentation is higher in a Co
urnot duopoly than in a Bertrand duopoly. (C) 2001 Elsevier Science BY All
rights reserved.