larry has saved $30 per week to buy a new blu-ray player. he compares two different models: a panaview that is priced at $130 and a zony model that is priced at $140. larry decides to purchase the zony blu-ray player for $140. identify what role money plays in each of the following parts of the story. hint: select each role only once. role of money medium of exchange unit of account store of value larry saved $30 per week. larry pays $140 for the blu-ray player. larry can easily determine that the panaview model has a lower price than the zony model.