Van is heading out to lunch. He goes to the bank and withdraws $30 from his savings account. He heads to a local deli that sells half sub sandwiches for $4.99 and whole subs for $7.99. Eric decides that he's pretty hungry and goes for the whole. He pays with a $10 bill and tells the cashier to keep the change. Identify what role money plays in each of the following parts of the story.
a. Role of money medium of unit of store
b. Exchange account of value
c. Eric can easily determine that the whole sandwich, while twice as long as the half, is priced at less than twice as much.
d. Eric accumulates money in his savings account for future purchases.
e. Eric buys his lunch with a $10 bill.