Interest Rates: Rising interest rates generally decrease bond values, as newly issued bonds offer higher yields, making older, lower-yielding bonds less attractive. Lower rates have the opposite effect.

Economic Growth: A strong economy can lead to higher inflation expectations, prompting the Federal Reserve to raise interest rates, thus potentially lowering bond prices. Slower growth can lead to lower rates and higher bond prices.

Inflation: Higher inflation erodes the purchasing power of future bond payments, leading investors to demand higher yields, causing bond prices to fall. Low inflation can increase bond values.

Credit Risk: Changes in the perceived creditworthiness of the bond issuers affect prices. Downgrades lead to lower prices, while upgrades raise them.

Supply and Demand: Increased supply of new bonds can lower prices, while high demand drives them up. Fed actions influence supply.

Market Sentiment: Investor risk appetite can shift bond prices. Flight to safety during uncertainty increases demand, pushing prices up. Risk-on sentiment decreases demand, lowering prices.