The issue of merging behavioral economics with the mainstream of economic thought is currently the subject of intense scientific debate. I would like to demonstrate the commonality of behavioral economics with classical economics, taking the view that the integration of these areas will take place soon. A comparison of the selective quotes of D. Ricardo, J. S. Mill, J. B. Say, J. Ch. Sismondi with the elements of theories underlying the behavioral economics, the concept of the bounded rationality and prospect theory allows finding out a lot of connection between these opinions. In this case, the authors had the same idea about the concept of the bounded rationality and prospect theory. However, this shows that behavioral economics can be viewed not as an opposition to the mainstream, as it looked, at least at the beginning of its development, but as a kind of return to the roots of economics. This significantly leads to the recognition of this research program as part of the mainstream of economic thought, in