Q. Illustrate what happens when a per unit subsidy is replaced with a revenue equivalent lumpsum subsidy/tax on good y when maximizing utility

Q. Which of the following is true of the production function (not pictured) that underlies this total cost function? (i) Total output increases as the quantity of inputs increases but at a decreasing rate; (ii) Marginal product is diminishing for all levels of input usage; (iii) The slope of the production function decreases as the quantity of inputs increases.