Interest Rate Environment: As a money market fund, IPPXX's yield, and thus its price, closely tracks short-term interest rates set by the Federal Reserve. Higher rates generally lead to higher yields and potentially a higher share price.

Credit Quality: The creditworthiness of the underlying securities in IPPXX's portfolio matters. Deterioration in the credit rating of these holdings can negatively impact the fund's net asset value (NAV).

Supply and Demand: Overall market sentiment and investor demand for safe haven assets like money market funds can influence the price. Increased demand may slightly push the price up.

Fund Expenses: The expense ratio, which covers operational costs, directly impacts the fund's yield. Higher expenses result in a lower yield and can indirectly affect the price.

Economic Conditions: Overall economic health and expectations about future economic performance affect interest rates and credit spreads, which in turn impact the performance of money market funds like IPPXX.