Who benefits from Bobbie’s price discrimination? Is the quantity of haircuts efficient?

Bobbie’s Hair Care is a natural monopoly. The table shows the demand schedule (the first two columns) and Bobbie’s marginal cost schedule (the middle and third columns). Bobbie has done a survey and discovered that she has four types of customers each hour: one woman who is willing to pay $18, one senior who is willing to pay $16, one student who is willing to pay $14, and one boy who is willing to pay $12. Suppose that Bobbie’s fixed costs are $20 an hour and Bobbie’s price discriminates.

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Price (dollars per haircut) 20 18 16 14 12 10 Quantity (haircuts per hour) 0 | 2 3 45 4 5 Marginal cost (dollars per hour) - 4 8 12 18