The expression "Let bygones be bygones" is associated with what type of cost?

Which of the following exchanges handles numerous technology companies including Intel and Microsoft?

a. NASDAQ b. NYSE c. AMEX d. None of the above handle technology stocks.

Many economists believe that

a. once a negative income tax system was in place, the United States could increase economic equality indefinitely without reducing economic efficiency. b. a negative income tax would be less efficient than the current welfare system. c. replacing the current welfare system with a negative income tax would increase both economic efficiency and economic equality. d. None of the above is correct.