In 1989, the city of Cincinnati authorized Discovery Network, Inc., to place 62 free-standing news racks on public property for distributing free magazines that con- sisted primarily of advertising for Discovery Network's service. In 1990, the city became concerned about the safety and attractive appearance of its streets and sidewalks and revoked Discovery Network's permit on the ground that the magazines were commercial handbills whose distribution was prohibited on public property by a preexisting ordinance. Discovery Network says the prohibition is an excessive regulation of its commercial speech and a violation of its rights. The city maintains the elimination of the newsracks decreases litter and increases safety. Is the ban on newsracks constitutional? [City of Cincinnati v. Discovery Network, Inc., 507 U.S. 410 (1993).]