Microeconomics

Suppose that the marginal benet of the xth additional unit of activity equals (4 + i) and the marginal cost of the xth additional unit of activity equals (4 i), where :1; is a positive integer. Then, from the perspective of a decision maker who is deciding how many units of activity to undertake: C The decision maker should not undertake any amount of the activity 0 The decision maker should engage in up to 1 unit of activity 0 The decision maker should engage in up to 4 units of activity 0 The decision maker should go on undertaking additional units of activity without ever stopping