<P> Successful price discrimination requires that companies separate consumers according to their willingness to buy . Determining a customer's willingness to buy a good is difficult . Asking consumers directly is fruitless: consumers don't know, and to the extent they do they are reluctant to share that information with marketers . The two main methods for determining willingness to buy are observation of personal characteristics and consumer actions . As noted information about where a person lives (postal codes), how the person dresses, what kind of car he or she drives, occupation, and income and spending patterns can be helpful in classifying . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2009) (Learn how and when to remove this template message) </Td> </Tr> <P>... Monopoly, besides, is a great enemy to good management . </P>

How does a monopoly control the price of its product