By Professor John M. McCann, Fuqua School of Business, Duke University 1991 URL: http://www.duke.edu/~mccann/mwb/1evolve.htm Firms are spending millions of dollars on data and systems for use by their sales and marketing managers and professionals. There are many reasons for making these major expenditures: to track the performance of brands and items in different markets over time, to … Continue reading The Evolution of Marketing Systems →