Canada has a well-developed media sector, but its cultural output — particularly in English films, television shows, and magazines — is often overshadowed by imports from the United States. Television, magazines, and newspapers are primarily for-profit corporations based on advertising, subscription, and other sales-related revenues. Nevertheless, both the television broadcasting and publications sectors require a number of government interventions to remain profitable, ranging from regulation that bars foreign companies in the broadcasting industry to tax laws that limit foreign competition in magazine advertising.