Suppose that 100 firms operate in a perfectly competitive industry and each firm has the same technology and cost structure. If each firm maximizes profits by selling 20 units of output at $5.00, then the quantity supplied in the market at $5.00 is:

One reason why better-looking workers may have higher earnings is that physical attractiveness may enhance a worker's productivity for certain jobs, especially for those workers who deal with the public

a. True b. False Indicate whether the statement is true or false

Supply shocks:

A. occur more frequently than demand shocks. B. usually result from fiscal and monetary policy changes. C. occur when sellers face unexpected changes in the availability and/or prices of key inputs. D. have been responsible for most of the recessions in the United States since World War II.