When interest rates rise, existing bond prices generally fall, and this relationship applies to municipal bonds just as it does to Treasuries and corporate bonds. The reason is competitive pricing in the market: newly issued bonds come to market offering higher yields (because prevailing rates are higher). To remain attractive, older bonds with lower coupon rates must trade at discounted prices so that their yield to an investor purchasing them today rises to a competitive level. Therefore, an increase in interest rates typically causes a decrease in the market price of an existing municipal bond, making choice A correct.

Choice B is the opposite of the correct interest-rate/price relationship. Choice C and D are incorrect because the question asks about the effect on a municipal bond already issued. The bond’s coupon rate (the stated interest rate on the bond) is fixed at issuance for most standard municipal bonds; market interest rates changing does not retroactively change the bond’s coupon. What changes is the bond’s market price and therefore its yield in the secondary market.

This concept is core SIE bond math/relationships: price and yield move inversely, and bond sensitivity to rate changes increases with longer maturities and lower coupons (i.e., more duration). Municipal bonds also carry other risks (credit, call/prepayment features, liquidity), but the direct effect of a general rise in interest rates is a market-price decline due to the need to adjust yields to current levels. The SIE outline specifically expects understanding of debt instruments and the relationship between price and interest rates.