Natural monopolies form when: 1. one firm receives patent protection for certain basic production processes. 2. long-run average cost declines as a firm expands output. 3. one firm has control over the entire supply of a basic input required to produce the product. 4. one firm's monopoly position is created and enforced by the government. 5. small firms merge to form larger firms.

Jason is looking for an engagement ring to offer his girlfriend. he has found a similar ring at each of four different jewelry stores. he doesn't have enough money to pay for the ring in cash, so he is planning on opening a line of credit (credit card) at the store he ends up buying the ring from. the chart below outlines the difference in the price of the rings the different stores offer as well as the difference in credit options. jason plans to pay off the ring purchase in 36 months. according to the information in the table, which of the jewelry stores will have the cheapest ring in the end?