Assume that a firm has some market power but cannot price discriminate. The change in total revenue while the firm generates an additional unit of output is: (i) a downward-sloping curve below the demand curve. (ii) zero when demand is price elastic. (iii) a downward-sloping curve above the demand curve. (iv) similar as for a perfectly competitive firm. (v) a horizontal line.
Can anybody suggest me the proper explanation for given problem regarding Economics generally?