consumer and competitive markets

Many U.S. companies have moved to other countries where tax rates are more favorable. Corporations argue that they owe it to their stockholders to locate where net profit is maximized. Corporations face double taxation in the United States since corporate profits and dividends paid to stockholders are taxable. Should we reduce or eliminate taxes on corporate profits in the United States to lure more of these companies back to the U.S.?

Please address the arguments on both sides of this issue.

Are consumers always better served by competitive markets? Is a monopoly ever justified? Give examples.