Interest Rates: Changes in interest rates significantly impact mortgage-backed securities (MBS). Rising rates decrease the value of existing MBS as newer securities offer higher yields.

Prepayment Risk: Borrowers may refinance or pay off mortgages early, affecting the fund's expected cash flows and yield. Higher prepayment rates reduce the fund's lifespan and potential returns.

Credit Risk: The risk that borrowers default on their mortgage payments. Higher default rates negatively impact the value of the underlying mortgages and the fund.

Economic Conditions: Overall economic health influences mortgage performance. A strong economy generally reduces default risk, while a recession can increase it.

Supply and Demand: The balance between the supply of new MBS and investor demand impacts prices. Increased supply can lower prices, while higher demand can increase them.

Inflation: Inflation erodes the purchasing power of fixed income investments. Higher inflation can lead to higher interest rates and lower MBS prices.

Federal Reserve Policy: The Federal Reserve's actions regarding monetary policy, including interest rate adjustments and quantitative easing, have a substantial impact on the MBS market.

Housing Market Conditions: The health of the housing market influences mortgage performance and prepayment rates. Strong housing markets reduce default risk and increase prepayment activity.

Government Regulations: Changes in government regulations related to the mortgage industry can impact the credit quality and marketability of MBS.

Investor Sentiment: Overall investor confidence and risk appetite can influence demand for MBS. Negative sentiment can lead to lower prices, while positive sentiment can increase them.