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RCI for sure ... but I think that Interval also uses a concept called trading power that is a scale that considers several factors like, the resort, the season, the size of the unit, the months of leadtime you give them with your deposited week. How they relate isn't clear and I don't think they tell you what your trading power is. But they consider it when you ask for an exchange. So for example... a "mud week" in Montana can't get you a week in Hawaii... most of the time. Other exchange companies seem to have a simpler system... basically a week is a week. Though there are some small adjustments depending on the service you use. Seems to me that weeks are not all the same. The rental differentials we see on RedWeek show that there's a lot of differences in the presumed values. But I'm wondering if people prefer the simplicity. Randy