Prior to accepting this job, I told them I would only take it with a 40 hour per week guarantee. It has nothing to do with my ability to make 40 hours per week, but more to do with giving them the incentive to make sure I have at least 40 hours worth of work to do in a week. IMHO, it's our responsibility to get the work done, but it's their responsibility to bring the work in. And, FWIW, I have not needed to cash in on the guarantee, nor do I expect to.