to wherever the system is living okay and somehow you would like to be able to make a statement that that captures that robustness that if the system parameters are known yeah then maybe static pricing is at least as good as there never is you know doing as good as dynamic pricing but when system parameters are unknown presumably you should gain something in robustness because you were using a dynamic pricing policy so there are a lot of different ways to give these kinds of robustness results and again in the revenue management