Interest Rates: MMHKX, a money market fund, primarily invests in short-term debt securities. Changes in prevailing interest rates directly influence the yields of these securities. Higher rates generally lead to higher yields and potentially a higher fund price, while lower rates can decrease yields and potentially lower the price.

Credit Risk: The creditworthiness of the issuers of the securities held within the fund affects the price. If an issuer's credit rating is downgraded, the perceived risk increases, potentially lowering the price of securities issued by that entity, impacting the fund.

Maturity of Holdings: The average maturity of the fund's holdings influences its sensitivity to interest rate changes. Longer maturities generally mean greater price volatility in response to rate fluctuations, while shorter maturities provide more price stability.

Fund Expenses: The fund's operating expenses, including management fees, directly affect the net return to investors. Higher expenses reduce the yield, potentially impacting the fund's attractiveness and, indirectly, its price.

Supply and Demand: Investor demand for the fund can impact its price, particularly if there are substantial inflows or outflows. Large redemptions may require the fund to sell assets, potentially influencing the price.

Economic Conditions: Overall economic health influences interest rates and credit quality. Economic growth may lead to higher interest rates, while a recession could trigger rate cuts and increase credit risk, impacting the fund.

Regulatory Changes: Changes in regulations governing money market funds can affect their investment strategies and risk profiles, potentially impacting the fund's price.

Inflation: Inflation expectations influence interest rates. Higher expected inflation typically leads to higher interest rates, which can affect the fund's yield and price.