How did consumer surveys become similar to public opinion surveys in the 1930s?

In the 1930s, consumer surveys and public opinion surveys became increasingly similar as both fields began to adopt shared market research techniques to analyze human behavior.1

Originally, market research focused on gathering data regarding consumer habits and preferences for goods, such as magazine readership or radio listening patterns. Around 1930, commercial researchers and scholars began applying these same sampling and survey methods to investigate political and social issues. This transition was driven by a growing interest in quantifying the motivations, beliefs, and suggestibilities of various groups.12

By the mid-1930s, statisticians like George Gallup were utilizing these refined techniques to conduct nationwide surveys on political topics, effectively bridging the gap between commercial marketing and public opinion polling. Consequently, the methodologies used to study the wants and habits of consumers were adapted to gather data on the opinions of voters, leading to a standardized approach in both domains. This evolution allowed organizations to apply similar statistical rigor to influence both commercial and political behavior.312