We study the competitive forces that shaped ideological diversity in the US press in the early twentieth century. We find that households preferred like-minded news and that newspapers used their political orientation to differentiate from competitors. We formulate a model of newspaper demand,...

This paper, "Competition and Ideological Diversity: Historical Evidence from US Newspapers" to which these Appendices apply is available at the following URL: "http://ssrn.com/abstract=2191104" http://ssrn.com/abstract=2191104

We use data on US newspapers from the early 20th century to study the economic incentives that shape ideological diversity in the media. We show that households prefer like-minded news, and that newspapers seek both to cater to household tastes and to differentiate from their competitors. We...