14. If the central bank buys $1,000 worth of bonds from a bank, what is the immediate change in the money supply? 15. If the central bank buys $1,000 worth of bonds from a bank, what is the immediate change in checkable bank deposits? 16. If the central bank buys $1,000 worth of bonds from a bank, what is the immediate change in required bank reserves? 17. If the central bank buys $1,000 worth of bonds from a bank, what is the immediate change in the bank's excess reserves? 18. If the central bank buys $1,000 worth of bonds from a bank, what is the total maximum change in the money supply? 19. If the central bank buys $1,000 worth of bonds from a bank, what is the total maximum change in checkable bank deposits? 20. If the central bank buys $1,000 worth of bonds from a bank, what is the total maximum change in required reserves in the banking system