Moving from the short-run to the long-run, what happens to the ability of firms to substitute between inputs? O It's more difficult to substitute between inputs in the long-run. It is equally easy to substitute between inputs in the long-run and the long-run. O It's easier to substitute between inputs in the long-run.Consider the following production function Q = 100LK, where w = 1 andr = 4. If Q. = 10, 000, what is the optimal L and K? O L* = 20, K* = 10 O L* = 10, K* = 10 O L* = 10, K* = 5 O L* = 20, K* = 5As the slope of an isoquant gets less curved (or straighter), what does it imply the magnitude elasticity of substitution coefficient? O The elasticity coefficient gets smaller in magnitude. O The elasticity coefficient gets larger in magnitude. O The elasticity coefficient doesn't change when the slope changes.In a perfectly competitive market, what is true about marginal revenue for the firm? It's increasing. It's negative. It's decreasing. O It's constant.Imagine the optimal inputs for a level of production are L* = 10 and K* = 20. What is the total cost of production if w = 2 andr = 5? 120 200 OOOO 150 100