That split of where the money goes comes directly from calculations and a spread...

That split of where the money goes comes directly from calculations and a spreadsheet that James Hamilton has developed. You should check out his Velocity talk for more (about 5 minutes in)

http://www.youtube.com/watch?v=kHW-ayt_Urk

The numbers on the slides modify the assumptions on the spreadsheet at http://perspectives.mvdirona.com/2010/09/18/OverallDataCente...