Public hospitals are suffering because of a lack of money available for physical expansion projects. To help hospitals, local governments plan to offer municipal bonds with above-average interest rates to induce individuals to buy these bonds, because as local governments get more money from municipal bonds, more money becomes available to public hospitals for physical expansion projects.

Which of the following, if true, raises the most serious doubt regarding the effectiveness of local governments' plan to increase the amount of money available for hospital expansion projects?