The most appropriate discount rate

The social opportunity cost of capital discount rate is the appropriate discount rate to use when evaluating government projects. It satisfies the fundamental rule that no project should be accepted that has a rate of return less than alternative available projects, and it ensures that worthy projects satisfy the potential Pareto test. The social time preference approach advocated by Moore et al. fails to satisfy either of these criteria even in the unlikely case that the private sector behaves myopically with respect to a project’s future benefits and costs.