Argues that the major studies supporting the Principle of Relative Constancy in consumption of mass communication products were statistically defective. Presents updated tests of data suggesting that the principle is actually of doubtful predictive value. (MS)

Presents results of a study of 300 magazine advertisements assessing the level at which the ads are objective and informative. Discusses how these ads are communications designed to influence consumer behavior to the extent that they correspond to the facts, are relevant, comprehensive, adequately supported, intelligible, and logical. (JMF)