Market Interest Rates: Rising interest rates typically decrease bond values, as newly issued bonds offer higher yields, making existing bonds less attractive.

Credit Quality of Holdings: Downgrades to the credit ratings of bonds within DTEYX.US portfolio negatively affect its price, signaling higher default risk.

Overall Economic Conditions: A strong economy can lead to higher inflation and interest rate expectations, potentially reducing bond values.

Inflation Expectations: Increased inflation erodes the purchasing power of fixed income, decreasing bond prices as investors demand higher yields.

Fund Management Decisions: Portfolio allocation strategies and security selection by the fund managers influence performance and therefore price.

Supply and Demand for the Fund: Higher demand for DTEYX.US will increase its price, while increased selling pressure will decrease it.

Maturity Dates of Holdings: Longer maturity bonds are more sensitive to interest rate changes than shorter maturity bonds, impacting fund price.

Call Provisions: Call features that allow issuers to redeem bonds early can limit upside potential and affect price, particularly in falling rate environments.