Final answer:
Diego's transactions with a debit card, saving for a car, and purchasing one serves as examples of money's functions. His use of a check is part of the M1 money supply while his certificate of deposit is part of M2. This illustrates how transactions affect and utilize different components of money supply.
Step-by-step explanation:
Diego's use of a debit card for transactions serves as a medium of exchange, allowing him to make purchases without the need for barter. When he deposits more money with the intention to buy a car, his money serves as a store of value, where it retains value over time until he makes the purchase. Upon seeing a car for sale at $8,000, money functions as a unit of account, providing a common measure for the value of the car. Writing a check for the car uses money within the M1 money supply, which includes checkable deposits and currency. Lastly, the $1,000 he puts into a certificate of deposit is part of the M2 money supply, which encompasses all of M1 plus savings accounts, small-denomination time deposits, and money market funds.
Applying this understanding to economic behaviors, the transaction series described illustrates different components of the money supply (M1 and M2) and the role of banks in facilitating economic activities.