the nondiscriminating monopolist's demand curve?

Answer 1

Is just like any other demand curve. Being a monopolist is related to the person or firm that is supplying a particular market - ie there is only one of them. The demand curve relates to how much the people that want to buy a product want the product. How much these potential purchasers are willing to pay has nothing to do with how many firms make it. Therefore, a demand curve faced by nondiscriminating monopolist is the exactly teh same as if the same product were made by a heap of perfectly competitive firms, oligopolistic firms etc.