Good analysis. Not sure I agree that they are all linear in degredation. Anything that serves a queue has superlinear degredation; as the service rate goes ove

Good analysis. Not sure I agree that they are all linear in degredation. Anything that serves a queue has superlinear degredation; as the service rate goes over the arrival rate. We've hit that tipping point in the UK and waiting times for access to medical treatment have ballooned; in our case aggravated by the exit of GPs. Kitchen staff also serve a queue, but I don't think that will have the same effect as people always have the option of eating at home.