Market Interest Rates: Rising interest rates generally decrease bond prices, as newly issued bonds offer higher yields, making older, lower-yielding bonds less attractive.

Credit Quality: Deterioration in the creditworthiness of issuers in the MABDX portfolio can negatively impact the fund's price, as investors demand higher yields to compensate for increased risk.

Inflation Expectations: Higher inflation erodes the purchasing power of fixed income investments, leading to lower bond prices as investors anticipate reduced real returns.

Economic Growth: Strong economic growth can put upward pressure on interest rates, which can negatively affect bond prices. Conversely, slower growth can lower rates and boost bond prices.

Supply and Demand: Increased selling pressure or reduced demand for the MABDX fund itself can lower its price, while higher demand can push the price up.

Fund Management: The fund manager's investment decisions, including security selection and duration management, directly affect the fund's performance and price.