Federal Funds Rate: The primary driver. ARCXX invests in short-term, high-quality debt, making its yield highly sensitive to changes in the Fed's target interest rate.

Treasury Yields: Influences ARCXX as it benchmarks against short-term Treasury securities. Rising Treasury yields generally push ARCXX's yield, and therefore price, higher.

Demand for Safe Assets: Increased demand, driven by economic uncertainty or risk aversion, can lead to more investment in ARCXX, potentially increasing its price.

Supply of Short-Term Debt: A decrease in the supply of instruments like Treasury bills could increase the demand for, and thus the price of, existing investments such as ARCXX.

Money Market Fund Regulations: Regulatory changes impacting money market funds can influence ARCXX's investment strategies and ultimately its price.

Credit Risk Perception: While ARCXX invests in high-quality debt, shifts in the perceived creditworthiness of issuers can slightly impact investor sentiment and fund value.