[Federal Funds Rate]: Changes in the Fed's target interest rate significantly impact FFCXX's yield and price, as it's a prime money market fund investing in short-term, high-quality debt instruments whose returns closely track prevailing interest rates.

[Supply and Demand for Short-Term Securities]: The relative supply and demand for instruments like Treasury bills, commercial paper, and repurchase agreements influence their yields, which in turn affects FFCXX's returns and price. Increased demand can lower yields and potentially the fund's returns.

[Credit Risk Perception]: Although FFCXX invests in very high-quality securities, changes in perceived creditworthiness of issuers can still subtly affect yields and the fund's price. Even slight increases in risk aversion can lead to higher yields for even short-term debt.

[Fund Management Fees and Expenses]: The expense ratio, which covers the fund's operating costs, directly reduces the fund's net yield. Higher expenses translate to lower returns and potentially a slightly lower relative price compared to similar funds with lower fees.