Ratings: A.C. Nielsen Company and the Birth of the Data Economy

Before clicks, likes, and algorithms, there was Nielsen. In the 1930s, Arthur C. Nielsen Sr. began measuring what Americans bought in stores, helping manufacturers understand their “market share” and what drove sales. He then turned to what Americans heard and watched. Nielsen’s radio and television ratings became a household name—and a powerful force shaping advertising, corporate fortunes, and which programs stayed on the air.

Drawing on family and corporate archives, Chris Wisniewski tells the story of the company that helped make measuring consumers central to American business. From the first televised presidential debate and the Apollo 11 moon landing to the finale of M*A*S*H and the rise of cable television, Nielsen’s numbers chronicled shared experiences and increasingly fragmented audiences. This history of family ambition and entrepreneurial invention also explores questions that have only grown more urgent: What do the numbers reveal? What power do they hold? And who decides what counts? Ratings tells the story of the company that helped turn everyday choices into a powerful business asset—and laid the foundations of today’s data economy.