Technique for assessing the success of advertising and marketing enticements by examining the number of sales of an item after it is promoted in one or more areas, and then correlating the data with sales of an identical item in regions wherein it has not been promoted. The technique demands that a variety of peripheral conditions, including the weather, which may have impacted consumer conduct for the duration of the interval evaluated be considered .
SALES-SURVEY TECHNIQUE: “The sales-survey technique is employed by marketing and advertising agencies.”