An L-shaped isoquant A) is impossible. B) would indicate that the firm could switch from one output to another costlessly. C) would indicate that the firm could not switch from one output to another. D) would indicate that capital and labor cannot be substituted for each other in production. E) would indicate that capital and labor are perfect substitutes in production. 6. Decreasing returns to scale in production means A) more than 10% as much of all inputs are required to increase output 10%. B) less than twice as much of all inputs are required to double output. C) more than twice as much of only one input is required to double output. D) isoquants must be linear. 7. A farmer uses M units of machinery and L hours of labor to produce C tons of corn, with the following production function C = 3L0.5 M0.75. This production function exhibits A) decreasing returns to scale for all output levels. B) constant returns to scale for all output levels