Interest Rate Changes: Higher interest rates generally decrease bond prices, as newly issued bonds offer more attractive yields.

Inflation Expectations: Rising inflation erodes the purchasing power of future fixed income payments, leading to lower bond prices.

Credit Risk Perceptions: Concerns about the ability of bond issuers to repay their debt can lower bond prices.

Economic Growth: Stronger economic growth can lead to higher interest rates and inflation, thus negatively impacting bond prices.

Market Liquidity: Less liquid markets can experience wider bid-ask spreads and greater price volatility.

Federal Reserve Policy: Changes in monetary policy, such as quantitative easing or tightening, can significantly impact bond prices.

Geopolitical Events: Global political instability or uncertainty can increase demand for safer assets like US Treasury bonds, potentially increasing their prices, but the opposite can also occur.