Today you have to run faster to stay in place.
I found marketing to be highly descriptive and prescriptive, without much of a foundation in deep research. I brought in economics, organization theory, mathematics, and social psychology in my first edition of Marketing Management in 1967. Today Marketing Management is in its 15th edition and remains the world's leading textbook on marketing in MBA programs. Subsequently, I wrote two more textbooks, Principles of Marketing and Marketing: an Introduction.