Inflation: Rising inflation erodes the real value of future bond payments, pushing prices down to compensate investors for this loss of purchasing power. Higher inflation expectations generally lead to lower bond prices.

Federal Reserve Policy: The Federal Reserve's monetary policy decisions, such as interest rate hikes or quantitative tightening, can significantly impact bond yields and prices. Rate increases usually decrease bond prices.

Economic Growth: Strong economic growth often leads to higher interest rates, as demand for capital increases. This can decrease bond prices. Conversely, slower growth may lead to lower rates and higher bond prices.

Supply of Bonds: An increase in the supply of 3-year Treasury bonds through auctions can put downward pressure on prices, as the market needs to absorb the additional supply.

Global Events: Geopolitical instability or major economic events in other countries can create uncertainty and impact demand for US Treasury bonds, affecting their prices as investors seek safe-haven assets.