Before revision:  Our analysis reveals that the optimal myopic policy is either full or no adoption. For sufficiently thick markets , we show that such a myopic policy is also optimal in the long run.
After revision:  Our analysis reveals that the optimal myopic policy and show that it takes a simple form: depending on volunteer characteristics and market thickness, either allow for full adoption or disallow adoption. In the long run , we show that such a myopic policy is also optimal in the long run.