Market Interest Rates: Rising interest rates can decrease the attractiveness of QDVSX, potentially lowering its price, as fixed-income investments become more appealing.

Credit Risk Perception: Changes in the perceived creditworthiness of the underlying mortgage-backed securities (MBS) within the fund affect investor demand and thus the fund's price. Worsening credit conditions can lower the price.

Prepayment Risk: Faster or slower than expected mortgage prepayments can impact the cash flow and yields of the MBS held by QDVSX, influencing its attractiveness and price.

Inflation Expectations: Higher inflation expectations can erode the real return of fixed-income assets, potentially leading to lower demand and a decreased price for the QDVSX fund.

Economic Growth: Strong economic growth typically reduces demand for safer assets like MBS, potentially lowering QDVSX's price, as investors shift towards riskier assets with higher return potential.

Federal Reserve Policy: Actions by the Federal Reserve, such as quantitative easing or changes in the federal funds rate, significantly impact the MBS market and consequently affect the price of QDVSX.