What will happen to the money supply and the equilibrium interest rate if the Federal Reserve sells Treasury securities?
$\begin{array}{lc}\text { Money supply } & \text { Equilibrium interest rate } \\ \text { a. increase } & \text { increase } \\ \text { b. decrease } & \text { increase } \\ \text { c. increase } & \text { decrease } \\ \text { d. decrease } & \text { decrease } \\ \text { e. decrease } & \text { no change }\end{array}$