Interest Rates: FSGXX is a money market fund, so its yield, and thus its price (NAV), is highly sensitive to short-term interest rate changes. Higher rates generally lead to higher yields and a slightly higher NAV.

Federal Reserve Policy: The Fed's monetary policy decisions, particularly those related to the federal funds rate, directly influence short-term interest rates and impact FSGXX's returns.

Credit Risk: While FSGXX invests in high-quality, short-term debt, changes in the perceived creditworthiness of these holdings can slightly affect its value. Default risks remain minimal.

Market Liquidity: The liquidity of the short-term debt market affects FSGXX. Reduced liquidity can slightly decrease the value of its holdings.

Fund Expenses: The fund's expense ratio impacts the net yield passed on to investors, subtly affecting the effective return.

Economic Conditions: Overall economic health, including inflation and growth, influences interest rate expectations and indirectly affects FSGXX's performance.