Market began to sell-off on rumors of a very strong Philly Fed this morning (was rumored by New York to be around 11.0). Of course that didn't come to fruition. Either way the 10yr traded nearly 2 million contracts from 108-02 to 107-30 over the past week leading into today. Obviously a large amount of retail stops built up below that support level and were easily taken out today. All week there has been talk of heavy MBS selling by dealers and commercial banks. Adding to that there is still heavy corporate supply into next week. Just way too much paper out there at the yearly lows in yields. Needed a little backup to accomodate it. Goldman also short 50,000+ at the 108 strike (Jan, Feb, March straddles) in the 10yr leaves us perpetually trading back to 108-00 from both directions.