If Kate volunteers to work at the annual book sale, she will not receive real money as payment. She will be given 'book credit' which she can use to purchase books at the sale. Think of a 'book credit' as a gift certificate to KFC. The gift certificate is only good for purchases at KFC... it cannot be used at other restaurants. The 'book credits' Kate receives will only be valid for purchases made at the annual book sale....they cannot be used at any other book sale.
Student or Learner