indicate which of the functions of money (a medium of exchange, a unit of account, and a store of value) each of the following performs in the u.s. economy. check all that apply. medium of exchange unit of account store of value british pound u.s. penny plastic credit card picasso painting given your answers to the previous task, indicate whether each of the following is considered money in the u.s. economy. money yes no british pound u.s. penny plastic credit card picasso painting