should companies be allowed to advertise in public schools

im not quite sure what u r asking here..first it depends on what kind of company..cigarette & condom companies l say no..second we have all kinds of companies in our yearbooks at the back of it because they buy the space in the pages to help pay for the cost of the yearbooks...and last..we have local companies that help to sponsor some of our athletic teams so l say if that is the case then why not let them advertise in the school with maybe a banner in the schools colors stating that they r a proud sponsor of the baseball, volleyball, cheerleading teams/squads