they look like classic revenue management problems but with strategic supply and so that that you know that perspective is something which opens up I think a range of algorithmic insight that isn't there yet in the literature so I'm going to skip the proof just because we're already well over time for this session I'm happy to talk to you about that offline if you want or if you play back the video and look at the slide slowly you should be able to make it out so last thing I'll tell you is and this result I think is less