The largest component of U.S. GDP is:

The Value of Call Monitoring Comcast's call center had a problem with unresolved incidents. Customers who called in for technical help often had to make follow-up calls because the first recommended solution did not work. Since the call center staff

were expected to handle an average of 10 calls per hour, Comcast suspected that calls were being terminated before the complaint had been resolved. As a possible solution, they hired supervisors to randomly listen into calls so as to better monitor inappropriate call terminations at a cost of $8,000 per month. This cut down the need for follow-up calls and, more importantly, increased customer retention. The number of customers who called in a complaint and would terminate services within three months was cut from 150 to 130 . How large must the present value of a retained customer's contribution margin be for additional monitoring to be profitable?

Jake experiences an increase in his wages. The hours of labor that he supplies to the market would decrease if

a. the income effect is larger than the substitution effect. b. the substitution effect is larger than the income effect. c. neither the income effect nor the substitution effect apply to Harry's labor-leisure tradeoff. d. Jake views both labor and leisure as inferior goods.