Role of managerial economics Economic versus accounting profits Implicit Costs Explicit Costs Opportunity Costs Normal Economic Profit . Marginal Analysis Given Total Net Benefit = Benefit - Cost Total Net Benefit (TNB) is maximized when it's first derivative (slope) = 0. TNB is maximized when MB-MC = 0, or when MB = MC. (For discrete problems TNB is maximized when MB-MC 2 0, or when MB = MC.) Be able to calculate MB and MC; Find the Q that maximizes TNB (where MB=MC)