This paper analyzes a regulation game with asymmetric information and
lack of commitment. It expands Besanko and Spulber's (1989) framework
to the case of elastic demands using a generalized Nash solution. It i
s found that the most important property of the equilibrium with inela
stic demand is not carried over to the elastic demand case, i.e., inco
mplete information worsens underinvestment, contrasting to Besanko and
Spulber's result.