In "Marketing Information: A Competitive Analysis,'' Sarvary and Parker (1997) (S&P) [Marketing Science, 16(1): 24-38] argue that, a reduction in the price of one information product can lead to an increase in demand for another information product -- information products can be gross...

In "Marketing Information: A Competitive Analysis,'' Sarvary and Parker (1997) (S&P) [Marketing Science, 16(1): 24-38] argue that in part of the parameter space that they considered, a reduction in the price of one information product can lead to an increase in demand for another information...