Many college campuses use student ID cards as a way for students to pay for on-campus expenses such as books, photocopie

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Many college campuses use student ID cards as a way for students
to pay for on-campus expenses such as books, photocopies, and food.
For convenience, some students will maintain a balance on their ID
cards. Are these balances a means of payment? Are they a store of
value? Explain why or why not.