15. the roles of money carlos wants to purchase a new computer and go to the caribbean for spring break. the computer is priced at $1,299, and the vacation is priced at $750. he has only $1,537 in his checking account, so he cannot afford to purchase both. after much thought, carlos buys the computer and writes a check for $1,299. identify what role money plays in each of the following parts of the story. hint: select each role only once. role of money medium of exchange unit of account store of value carlos can easily determine that the price of the computer is more than the price of the vacation. carlos has $1,537 in his checking account. carlos writes a check for $1,299.