come together in one place so this would just be I think you know a pure theoretical exercise it would be fun to build a model of something like that now of course you want to do that with some purpose in mind in our case the motivation for wanting to do this in the first place is that we sort of wanted to try to understand what the advantages were of using a dynamic pricing policy over static price policy and I'll explain more what I mean by that as we go on so I'll skip this side as well I just want to briefly