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

Credit Risk: A deterioration in the creditworthiness of the bond issuer (municipalities) leads to lower prices due to increased risk of default.

Economic Conditions: Economic downturns can negatively impact municipal finances, potentially affecting bond values.

Inflation Expectations: Higher inflation erodes the purchasing power of future bond payments, potentially decreasing bond prices.

Supply and Demand: Increased supply of similar municipal bonds can lower prices, while higher demand pushes them up.

Tax Law Changes: Alterations to tax laws impacting the tax-exempt status of municipal bonds can significantly affect demand and pricing.

Call Provisions: Bonds with call provisions may be redeemed by the issuer before maturity, potentially limiting price appreciation.

Fund Management: The fund manager's investment decisions, strategy, and expense ratio influence the fund's overall performance and price.