Interest Rates: Rising rates generally decrease JMBS.US prices as existing lower-yielding mortgages become less attractive.

Mortgage Prepayment Rates: Faster prepayments can negatively impact prices if new investments yield lower returns.

Credit Spreads: Widening spreads (increased risk perception) can lower prices, while narrowing spreads can increase them.

Economic Growth: Strong economic growth can lead to higher interest rates and potentially lower JMBS.US prices.

Inflation: Higher inflation often pushes interest rates up, negatively affecting JMBS.US prices.

Federal Reserve Policy: Actions like quantitative easing or tightening significantly influence mortgage rates and JMBS.US prices.

Housing Market Conditions: A strong housing market can increase prepayment rates and affect the demand for new mortgage-backed securities.

Supply and Demand: Increased supply of new mortgage-backed securities can put downward pressure on JMBS.US prices.

Investor Sentiment: General market optimism or pessimism can influence demand for fixed-income assets like JMBS.US.