Hi, two part assignment that I need help with desperately, thank you!

A: Explain how economies of scale can be a barrier to entry

B: Refer to Page 159 - 9-4 Summarize what causes the dead-weight loss of monopoly - Problem #5

9-4 Summarize what causes the deadweight loss of monopoly (Monopoly and the Allocation of Resources) What is the problem with monopoly? Compare monopoly to the benchmark of perfect competition established in the previous chapter. Use the exhibit below for reference. Identify the deadweight loss] Pm Dollars per unit C So= MC - ATC PE D = AR MR Om Quantity per period