When a firm is operating in a perfectly competitive labor market the wage the firm increases with the number of workers hired. the firm can buy as much or as little labor as it wants at a fixed, going wage rate. the firm’s marginal expense of labor (mel) equals the cost of all workers hired.

John and daphne are saving for their daughter ellen's college education. ellen just turned 10 at (t = 0), and she will be entering college 8 years from now (at t = 8). college tuition and expenses at state u. are currently $14,500 a year, but they are expected to increase at a rate of 3.5% a year. ellen should graduate in 4 years--if she takes longer or wants to go to graduate school, she will be on her own. tuition and other costs will be due at the beginning of each school year (at t = 8, 9, 10, and 11).so far, john and daphne have accumulated $15,000 in their college savings account (at t = 0). their long-run financial plan is to add an additional $5,000 in each of the next 4 years (at t = 1, 2, 3, and 4). then they plan to make 3 equal annual contributions in each of the following years, t = 5, 6, and 7. they expect their investment account to earn 9%. how large must the annual payments at t = 5, 6, and 7 be to cover ellen's anticipated college costs? a. $1,965.21b. $2,068.64c. $2,177.51d. $2,292.12e. $2,412.76

By which distribution system is more than 90 percent of u.s. coal shipped? a. pipelinesb. trucksc. waterwaysd. railroadse. none of the above

Complete electronics inc. sells a point-of-sale computer with a two-year service contract. complete collects $ 2 comma 500 cash for the selling price of the computer and $ 576 for the two-year service contract. how is revenue recognized?