Please answer with clear explanation

Everyone knows that peanut butter and jelly are complements, but there is violent disagreement as to the proper ratio. In particular: half of all people believe you should have use twice as much peanut butter as jelly. The other half believe you should use twice as much jelly as peanut butter. Assume average income in these two groups is the same. True or false: the market demand curve for peanut butter is the same "as if" everyone believed you should have peanut butter and jelly in a 1:1 ratio. O True O False As you move down and to the right along the demand curve D(p) = 400p-2, the price elasticity of demand: O Increases Decreases O Decreases and then increases O Increases and then decreases O Is constant A perfectly competitive firm has a total cost function given by c(y) = 8+ 2yz At what price will the firm earn zero economic profit? OO 4 O 16 Which of the following is an example of second-degree price discrimination? O A sunglasses seller doesn't list prices, but charges each customer according to the most he thinks they'll pay O An airline doesn't know who is willing to pay more for a better in-flight experience, so it gets its customers to self-sort by offering really lousy coach seats for a low price, and really nice business class seats for a high price O A software company can't tell who likes word processors or spreadsheets more, so they sell a software suite containing both rather than selling each program individually O A movie theater sells tickets at a discount to students with ID