The Cost Benefit Principle refers to where: Question 19 options: In order to maximize a Profit, a firm needs to produce every unit, and only those units, for which Marginal Revenue is greater than or equal to Marginal Costs of Production. In order to maximize a Profit, a firm needs to produce every unit, and only those units, for which Marginal Revenue is less than or equal to Marginal Costs of Production. In order to maximize a Profit, a firm should only produce those products where there is limited competition from other suppliers. In order to maximize a Profit, a firm should only produce products from which there is a Positive Externality created