RT Journal Article SR Electronic T1 Short-Term Effects of Advertising: Some Well-Established Empirical Law-Like Patterns JF Journal of Advertising Research JO J Advert Res FD WARC SP 186 OP 192 DO 10.2501/S0021849909090266 VO 49 IS 2 A1 Leslie Wood YR 2009 UL http://www.journalofadvertisingresearch.com/content/49/2/186.abstract AB Extensive work with single-source data since the 1960s has consistently shown that advertising has a pronounced short-term effect on sales, that this effect decays over time, and that creative copy is the largest contributor toward effectiveness. This article shares the foundations for these generalizations as well as more current examples that use Project Apollo data.