A bond$$s credit rating provides a guide to its price. In early $2012,$ Aaa bonds yield $5\mathrm{.}15\%$ and Baa bonds yield $5\mathrm{.}85\%.$ If some bad news causes a five$-$year bond with a coupon rate of $5\%$ paid annually to be unexpectedly downrated from AAA to BBB$,$ critically discuss what would be the effect on the bond price?