Interest Rate Changes: Rising rates typically decrease VMATX value as existing bonds become less attractive. Falling rates increase value.

Credit Quality: Downgrades in bond ratings held by VMATX can reduce its price. Upgrades increase the price.

Inflation: Higher inflation erodes bond values, decreasing VMATX price. Lower inflation increases the price.

Economic Growth: Strong economic growth can lead to rising interest rates and lower bond prices in VMATX. Weaker growth can have the opposite effect.

Supply and Demand: Increased demand for VMATX drives up its price, while increased supply lowers it.

Maturity Dates: Bonds with longer maturities are more sensitive to interest rate changes, influencing VMATX price volatility.

Market Sentiment: Overall investor risk appetite impacts demand for bond funds like VMATX.

Fund Management: Decisions regarding security selection and duration management affect VMATX performance.

Expense Ratio: VMATX's expense ratio directly impacts its net return, though not necessarily its price.