the platform takes a fixed fraction of every dollar that's spent and you know I think that's fairly consistent with how the platform's work today but it's kind of interesting I mean it's a mechanism designer you might actually think this is one of the very first things you would want to design you'd want to optimize over so our work does not optimize over this it kind of holds that as an exogenous constant I think one of the most interesting things to do is to kind of a lot of questions during chrises talk on Monday I think alluded