How does the buying and selling of bonds on the secondary market affect daily mortgage rates?
Mortgage rates are linked to bond markets because lenders often sell mortgages into mortgage-backed securities, and investors compare those securities with Treasuries plus compensation for prepayment, duration, and credit-related risks.
The simple version
Daily mortgage rates follow investor demand for bonds, especially Treasuries and mortgage-backed securities. The practical question is not only what the phrase means, but which balance sheets, legal promises, exchange rates, or market prices change first.
How the mechanism works
Mortgage rates are linked to bond markets because lenders often sell mortgages into mortgage-backed securities, and investors compare those securities with Treasuries plus compensation for prepayment, duration, and credit-related risks. In the real world, the effect usually travels through institutions rather than straight from a headline to a household. Governments, central banks, banks, investors, creditors, importers, exporters, and citizens each respond to the new incentives they face.
Why it matters
When Treasury yields rise or mortgage spreads widen, new mortgage rates usually rise. When safe yields fall and spreads are stable, mortgage rates often fall. That is why this topic shows up in market prices, public budgets, savings decisions, borrowing costs, and political debates. The direct effect can be financial, but the second-round effects often show up in employment, prices, credit access, or confidence.
Common misconception
The mistake is thinking the Fed directly sets 30-year mortgage rates. The Fed influences them, but secondary-market investors price them every day. A useful way to avoid the mistake is to ask three questions: who owes what, in which currency, and on whose balance sheet does the risk sit?
Related pillar
This article is part of the US Treasuries macro pillar. Read the pillar after this article if you want the surrounding concepts and links to the other guides in the same cluster.