Of the following market structures, which has the fewest number of firms competing against each other?

At the current price of a good, Jessica's consumer surplus equals 12, Lauren's consumer surplus equals 14, and Isabel's consumer surplus is 4. By perfect discrimination, a monopolist could increase his profit by

A) 4. B) 12. C) 16. D) 30.

If Polaroid wanted damages against Kodak for infringing on its instant development film process, and the courts found a high positive cross elasticity between purchases of Polaroid instant film and 35mm regular film, would that have strengthened or weakened Polaroid's claim against Kodak?