Answer and Explanation:
The identification of the role that money plays in each of the following transactions done:
1. In the case when Van write the check so it would be classified as the medium of exchange
2. When van would easily measures the price of the super i.e. higher than the duper price so it would be classfied as the unit of the account
3. And, when van saved the amount of $4,000 in his checking account so it would be classified as the store of the value