"Intervening variables are essential to psychological analysis because without them our description of economic behavior would remain incomplete, our understanding of behavior limited, and our predictions of future behavior incorrect."

“Unlike pure theorists, we shall not assume at the outset that rational behavior exists or that rational behavior constitutes the topic of economic analysis. We shall study economic behavior as we find it. In describing and classifying different reactions, as well as the circumstances that elicit them, we shall raise the question whether and in what sense certain reactions may be called “rational.” After having answered that question and thus defined our terms, we shall study the fundamental problem: Under what conditions do more and under what conditions do less rational forms of behavior occur?”

“Motives, attitudes, and expectations of consumers and businessmen play a significant role in determining spending, saving, and investing and that modern psychology provides conceptual as well as methodological tools for the investigation of economic behavior.”

“During the past three decades numerous empirical studies of economic behavior have been carried out and their theoretical foundation has been clarified. There was a rapid development and articulation of data, theory, and methodology. A new discipline of behavioral economics was emerging consists of the empirical investigations of the behavior of businessmen and consumers in one country in one time. Generalizations about economic behavior emerge gradually by comparing behavior observed under different circumstances.”