Because the menu is fixed. It is important that all dishes selected be popular with the attendees of the banquet. The demographics of the group therefore become very important. Particular selections might be eliminated because of religious or ethnic considerations. Still, some groups of highly educated and high-income clients may prefer certain food selections over dishes that might be preferred by another group with lower education and income. Age is another factor to take into consideration. It would certainly be inappropriate to propose the same menu to teenagers as to a group of senior citizens having a high tea.