That's a very thoughtful question. Thank you. A couple things; First, just with respect to how CDS will unfold against that fixed cost; when we first announced the acquisition of Creditex, we said we thought the market would become more standardized, more transparent, and clearer, and more electronic. My God, we've only owned Creditex for a matter of months, and already the industry has agreed on the standardization, agreed on new default procedures for cash settlements, backed us in our clearing initiative, and our electronic business in Creditex has substantially increased. So, when I was telling you that, I didn't really think that it was going to happen really in six months. So, this CDS market is morphing on an accelerated pace, given all of the stress that exists in the credit market today. So in that regard, it's hard to know what that curve looks like, if you were to graph it. But certainly, the trend is towards where we have placed the company. Now, we, came into this looking at how we did clearing for OTC Energy and when we first started clearing OTC Energy, my colleague Chuck Vice who's sitting here quietly and some of my other colleagues, we were able to go into a market that was very small comparatively, and we were able to use our future's infrastructure because a lot of the OTC customers also traded related futures and the OTC markets at that time were very, very related to what existed in the future's market. So, using the future's infrastructure was how we attacked OTC clearing for energy. What we found in credit is that, there wasn't the related future. The infrastructure, the technology infrastructure didn't exist in the Future's market, and it's why we had to acquire a lot of this. It's frankly, I think, why we're doing real clearing, while some of the other people that are trying to get into this business are struggling relative to us. So that infrastructure is really being tied into the OTC desks of many of the major dealers and many of the major buy-side and as these markets become available for clearing as the market wants to push them into clearing houses. One thing that we will have is connectivity and obviously a good relationship with a lot of the Wall Street banks that's hold a lot of open interests and so we'll just have to see how that unfolds. We're being very communicative with the marketplace. We're being very open to ideas and trying to be entrepreneurial around this, as our customers are facing more pressures to manage their risk.