If labor is the only variable input of a firm and the marginal product of labor is falling, the firm will always product

A. more than the profit-maximizing level of output

B. less than the profit-maximizing level of output

C. at a level of output where average total cost is at a minimum

D. at a level of output where marginal costs are rising

E. at a level of output where average variable costs are falling

While cell phones with holographic keyboards are currently in the introduction stage of the industry life cycle, tablet computers are in the growth stage. in the context of this scenario, which of the following statements is true? a. the industry for cell phones with holographic keyboards will face greater competition than the tablet industry. b. while the industry for cell phones with holographic keyboards will focus more on product innovation, the tablet industry will focus more on process innovation. c. while the industry for cell phones with holographic keyboards can reap the benefits of economies of scale, the tablet industry will experience no such benefits. d. the industry for cell phones with holographic keyboards will face price competition, whereas, in the tablet industry, the mode of competition will be non-price.