Under the Patient Protection and Affordable Care Act (ACA), every company with more than 200 employees must offer health insurance to its employees and must automatically enroll them in the plan

Which of the following four-firm concentration ratios would be the best indication of a perfectly competitive industry?

A) 2 percent B) 31 percent C) 78 percent D) 100 percent E) 50 percent

In a fixed exchange rate system, rates are maintained by the central bank's ongoing purchases and sales of currencies

a. True b. False