Newspapers are becoming more balanced businesses, with a healthier mix of revenues from readers and advertisers. American papers have long been highly unusual in their reliance on ads. Fully 87％ of their revenues came from advertising in 2008, according to the Organization for Economic Cooperation & Development (OECD). In Japan the proportion is 35％. Not surprisingly, Japanese newspapers are much more stable.

Compared with their American counterparts, Japanese newspapers are much more stable because they________.