Interest Rates: Rising interest rates generally decrease the value of money market funds like FWMMX.US as yields on new investments become more attractive.

Credit Risk: Downgrades or defaults of securities held by the fund can negatively impact its net asset value (NAV) and subsequently, its price.

Maturity: The average maturity of the portfolio affects sensitivity to interest rate changes; longer maturities mean greater sensitivity.

Fund Expenses: Higher expense ratios can reduce the yield and make the fund less attractive relative to peers, potentially impacting demand.

Supply and Demand: Basic economic principles apply; increased demand can lead to a slight premium over NAV, while decreased demand can lead to a slight discount.

Market Conditions: General economic uncertainty or market volatility can influence investor sentiment, affecting flows into or out of the fund.

Fund Manager Performance: The ability of the fund manager to select high-quality, short-term investments can impact the fund's returns and attractiveness.

Inflation Expectations: Rising inflation expectations may lead investors to seek higher-yielding alternatives, potentially reducing demand for FWMMX.US.