The social value of information on product quality

In the context of a seller with private information about product quality, I show that revelation of information on product quality is sometimes, but not always, socially valuable. When it is socially valuable, there is generally a tradeoff between the acquisition and revelation of finer, but more costly information and the revelation of coarser, but less costly information. As a result, it can be socially optimal for firms to reveal only coarse private information.