US 30-Year Mortgage Rate (Sep/10) 6.76% (Prev. 6.71%)

The transmission channel runs from the ten-year yield and the mortgage spread over Treasuries into housing affordability, refinance activity and, at the margin, bank origination volumes and prepayment speeds in MBS. Historically the more informative companion reads have been the purchase and refinance application indices released alongside the rate, since volume responses have tended to be sharper than the rate moves themselves, particularly when the level sits near thresholds that have previously gated refi waves. The spread component is worth separating from the rate component: widening or narrowing of mortgage spreads over benchmarks has at times mattered more than the headline rate, especially in periods of constrained balance-sheet capacity. Follow-ons are the next long-end auctions and any shift in MBS demand from the central bank and bank portfolios, which set the spread leg. A five basis point week-on-week change does not alter the picture on its own.