U.S. advertisers, who spend some $200,000,000 a year trying to persuade people to buy things, have never been quite sure what they were getting for their money, who was listening to their programs or for how long. Even replies to questions asked of radio listeners are not conclusive (few people watch their own radio habits like hawks). But last week the radio industryfor a pricehad a good chance of increasing considerably its knowledge of its audiences.
Chicago's A. C. Nielsen Co., whose food, drug and liquor indexes are gospel to U.S. merchandisers,...
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