Based on what is defined by a macroeconomist, do the following situations represent saving or investment? Explain. (a) Your family takes a mortgage and buys a new house. (b) You use your $200 paycheck to buy Apple's shares. (c) Your friend earns $100 and deposits it in his bank account. (d) You borrow $5,000 from a bank to buy a van to use for your parcel delivery business