The goal of product differentiation and advertising in monopolistic competition is to make: A. The firm allocatively efficient even if it is not productively efficient
B. The firm productively efficient even if it is not allocatively efficient
C. Price less of a factor and product differences more of a factor in consumer purchases
D. Price more of a factor and product differences less of a factor in consumer purchases

You are considering the purchase of one of two machines used in your manufacturing plant. machine 1 has a life of two years, costs $20,000 initially, and then $4,000 per year in maintenance costs. machine 2 costs $25,000 initially, has a life of three years, and requires $3,500 in annual maintenance costs. either machine must be replaced at the end of its life with an equivalent machine. using eac which is the better machine for the firm