The Federal Reserve was created in

Which of the following is not a technical barrier to entry in a monopolized market?

a. A patent b. Decreasing average cost c. A low cost method of production known only by monopolists d. Increasing returns to scale

Using the rule of 70, about how much would $100 be worth after 50 years if the interest rate were 7 percent?

a. $400 b. $800 c. $1,600 d. $3,200