Federal Funds Rate: JNMXX's yield is highly sensitive to changes in the Federal Reserve's federal funds rate. Higher rates typically lead to higher yields.

Treasury Bill Yields: Since JNMXX invests in short-term U.S. Treasury securities, yields on these bills directly impact the fund's performance. A rise in T-bill yields generally increases JNMXX's yield.

Money Market Conditions: Overall liquidity and demand within the money market influence yields. Scarcity of funds can push rates higher.

Inflation Expectations: Anticipated inflation can affect short-term rates as investors demand higher returns to compensate for future purchasing power erosion.

Economic Growth: Strong economic growth often leads to higher interest rates, benefiting JNMXX's yield, while slower growth might depress rates.

Geopolitical Events: Unexpected global events can create uncertainty and influence investor demand for safe-haven assets like Treasury bills, potentially affecting JNMXX.

Supply of Treasury Bills: An increase in the supply of new Treasury bills might lower their prices, potentially impacting JNMXX's returns.