6. Suppose that demand for potatoes from Prince Edward Island currently is P = 85 - 2Q, where Q represents bushels of potatoes. The marginal costs of production are $9 per bushel. Potatoes are sold in a perfectly competitive market. Anne, a local activist, is trying to win support for an irrigation project on the Island that would lower the marginal costs to $5 per bushel.

1. How many bushels of potatoes are sold when marginal costs are $9? Illustrate on a graph. What is the total willingness to pay for this many potatoes?
2. How many bushels would be sold if marginal costs fell to $5? Illustrate on a graph. What is the total willingness to pay for this many potatoes?
3. Based on your answers to (a) and (b), what would be the benefit of the new potatoes available after installation of the irrigation project?