The process by which an decrease in the money supply changes equilibrium is described by which of the following sequences? a. MS down; interest rate up; investment spending up; equilibrium income up. b. MS down; interest rate up; investment spending down; equilibrium income down c. MS down; interest rate down; investment spending down; equilibrium income down. d. MS down; interest rate down; investment spending up; equilibrium income down e. MS down; interest rate down; investment spending up; equilibrium income up