Interest Rate Changes: When the Federal Reserve raises or lowers interest rates, the yield of NWSXX.US, a money market fund, typically adjusts accordingly, impacting its price. A rise in rates usually boosts yields and potentially the price.

Credit Risk: If there are concerns about the creditworthiness of the securities held within NWSXX.US (such as commercial paper or Treasury bills), this can depress the price of the fund, reflecting increased perceived risk.

Supply and Demand: Higher demand for NWSXX.US, often driven by investors seeking a safe haven or higher yields compared to alternatives, can push the price upwards, while increased supply can have the opposite effect.

Inflation Expectations: Rising inflation expectations can lead investors to demand higher yields, potentially putting downward pressure on the price of NWSXX.US if its yield doesn't keep pace.

Economic Conditions: General economic health affects investor sentiment. A strong economy could decrease demand for very safe assets like money market funds, impacting the price.

Regulatory Changes: New regulations impacting money market funds can affect their attractiveness and risk profile, leading to price adjustments.