Alex just graduated from college and is now in the market for a new car. he has saved up $4,000 for a down payment. he's deciding between a super and a duper. the super is priced at $23,599, and the duper is priced at $18,999. after agonizing over the decision, he decides to buy the duper. he writes the dealership a check for $4,000 and takes out a loan for the remainder of the purchase price. 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 alex writes a check for $4,000. alex can easily determine that the price of the super is more than the price of the duper. alex has saved $4,000 in his checking account.