Fund performance will depend on the interplay of these factors. Interest Rates: Higher interest rates generally lead to higher yields for money market funds like IDSXX. Conversely, lower rates result in lower yields.

Credit Risk: The creditworthiness of the issuers of securities held by the fund impacts its perceived risk and thus its yield. Higher risk issuers may offer higher yields, but also increase the chance of default.

Maturity of Holdings: Funds holding shorter-term securities are generally less sensitive to interest rate changes compared to those holding longer-term securities.

Supply and Demand: Investor demand for money market funds can influence yields. Increased demand may push yields slightly lower, while decreased demand may push them higher.

Fund Expenses: The fund's expense ratio directly reduces the net yield available to investors. Higher expense ratios lead to lower net yields.

Economic Conditions: Overall economic health and inflation expectations can influence interest rate policy and therefore the yields of money market funds.