Which of the following statements is true of s-curves in technological improvement? a. they are obtained by plotting the cumulative number of adopters of the technology against time. b. they typically show that technology goes through initial accelerated improvement, then diminishing improvement, then slow improvement. c. s-curves in technology diffusion and s-curves in technology performance are fundamentally the same process. d. the s-curves flatten when the cost of each marginal improvement increases and diminishing returns to effort begin to set in.

As a result of a labeling mistake at the chemical factory, a farmer accidentally sprays weedkiller rather than fertilizer on half her land. as a result, she loses half of her productive farmland. if the property of diminishing returns applies to all factors of production, she should expect to seea. a decrease in the marginal productivity of her remaining land and an increase in the marginal productivity of her labor. b. an increase in the marginal productivity of her remaining land and an increase in the marginal productivity of her labor. c. an increase in the marginal productivity of her remaining land and a decrease in the marginal productivity of her labor. d. a decrease in the marginal productivity of her remaining land and a decrease in the marginal productivity of her labor.