Could you please provide the solution to this question?

Please draw graphs or tables etc if needed to answer the question and show working out when doing calculations.

Thank you!

Answer the following part-questions. (a) Why do people save? (b) Why do people borrow? (c) Assuming savers and borrowers want to save and borrow, respectively, the same amount of money, why can't they get together themselves to exchange funds? In other words, why is there a need for a bank to intermediate between savers and borrowers? (d) Can the existence of banks change the magnitude of short-run economic uctuations