Media Competition and News Diets
利用1944-1964年美国电视推广的准随机变化，研究电视进入如何冲击报纸的读者和广告市场，导致报纸削减内容尤其是本地新闻，并影响选举中的政党投票一致性。
Technological innovations like broadcast television and the internet challenge local newspapers’ business model of bundling their local content with third-party content, such as wire national news. We examine how the entry of television affected newspapers and news diets in the United States. We construct a dataset of newspapers’ economic performance and content choices from 1944 to 1964 and exploit quasi-random variation in the rollout of television to show its negative impact in the readership and advertising markets. Newspapers responded by reducing content, particularly local news. We tie this change to increased party vote share congruence between congressional and presidential elections.