Long-run economies of scale exist when the long-run average cost curve

In An Inquiry into the Nature and Causes of the Wealth of Nations, Adam Smith listed three reasons for productivity to increase with specialization. What are these three reasons?

What will be an ideal response?

Suppose a monopolist's demand curve is P = 60 - Q, and its cost function is C = 10Q + 50 so its marginal cost is 10

If a governmental agency wished to set the price so that it created the smallest deadweight loss without causing the monopolist to have negative economic profits (thus shutting down), that price would be A) $10.00. B) $11.02. C) $14.57. D) $35.00.