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Advertising is an input for many final goods, and broadcast television comprises a significant portion of ad spending in the United States. Yet, advertisers face different costs when purchasing national television ads. We seek to empirically confirm differences in firms’ costs to advertise nationally. Network-advertiser contracts are secret, so we combine data on ad placements and average prices of program airings to analyze price dispersion. We document that “legacy” advertisers with established broadcast relationships receive favorable prices for equivalent ad inventories. This may benefit incumbents and potentially soften price competition from newcomers in product markets. History: Avi Goldfarb served as the senior editor for this article. Funding: Financial support from the National Science Foundation [Grant SES-1919040] is gratefully acknowledged. Supplemental Material: The online appendix and data are available at https://doi.org/10.1287/mksc.2023.1442 .