For example, the monopolist may be able to sell 1 unit for $10 or 2 units for $9 each. This does not mean that 1 unit can be sold for $10 and two more for $9 each,because one of the two buyers who would pay $9 is the same one who is willing to pay $10. The monopolist's choice,then,is to sell a single unit for $10 or 2 units for $9 each. If the latter option is chosen,AR is $9 but MR is $8. This can be seen in Table 7-2.