Inflation Expectations: Rising inflation expectations typically increase the value of RPIHX.US as it invests in Treasury Inflation-Protected Securities (TIPS).

Real Interest Rates: Decreasing real interest rates (nominal interest rates minus inflation) make TIPS, and thus RPIHX.US, more attractive.

Treasury Yields: General movements in Treasury yields influence TIPS yields; higher Treasury yields can decrease the value of RPIHX.US, especially if inflation expectations remain stable.

Market Sentiment: Investor appetite for inflation protection influences demand for TIPS and therefore RPIHX.US. Risk aversion can drive investors towards these assets.

Economic Data: Key economic releases (CPI, GDP) impact inflation expectations, which then affect RPIHX.US's price. Strong economic data might lower demand.

Federal Reserve Policy: Actions by the Federal Reserve related to interest rates and monetary policy significantly influence inflation expectations and bond yields.

Supply and Demand: Changes in the supply of TIPS and investor demand for these securities affect the prices reflected in the fund's NAV.

Fund Expenses: The fund's expense ratio can affect the overall return to investors relative to its benchmark; higher expenses decrease the net return.

Credit Risk: While minimal due to TIPS being government-backed, broader concerns about U.S. government debt could indirectly affect demand.

Liquidity: The liquidity of the underlying TIPS market and the fund itself can affect pricing, particularly during periods of market stress.