If the marginal cost of producing hair styling decreases, then the efficient quantity of hair stylings to produce ________

All firms can increase profits using price discrimination

A) True, because market demand curves are downward sloping B) True, because firms can sell different versions of a product that is just right for an individual consumer C) False, because consumers aren't forced to buy a firm's products D) False, because some firms are in competitive markets

Suppose Julia and Zach are the only consumers of milk. Julia's demand for milk is defined as QdJulia = 12 - 3P at prices below $4 and zero for prices above $4. Zach's demand for milk is defined as QdZach = 10 - 2P at prices below $5 and zero for prices above $5. In this case, the market demand curve for milk is:

A. is upward sloping. B. a downward sloping straight line. C. kinked at a price of $5. D. kinked at a price of $4.