Briefly explain whether each of the following statements is true or false:
a. The higher the price of bonds, the greater the quantity of bonds demanded.
b. The lower the price of bonds, the smaller the quantity of bonds supplied.
c. As the wealth of investors increases, all else held constant, the interest rate on bonds should fall.
d. If investors start to believe that the U.S. government might default on its bonds, all else held constant, the interest rate on those bonds will fall.