Excerpt:
Chart of the Week: Mortgage Rates Follow MBS Yields, Not 10-Year Treasury YieldsThere is much more in the post. You can subscribe at https://calculatedrisk.substack.com/
For an explanation of “why”, see Lawler: Update on Mortgage/Treasury Spreads
From Tom Lawler:
30 Year FRM: Optimal Blue Conventional Conforming 30-year Fixed-Rate Mortgage where LTV<=80% and FICO>740.
CC MBS Yield: Yield on notional par agency 30-year MBS
Note: there is some “spurious” volatility in the mortgage spreads because Optimal Blue measures rate lock activity throughout the day while the MBS and Treasury yields reflect late afternoon yields.