Economics imperialism is broadly explained as economics having an impact on other disciplines. But how should economics imperialism be understood when it is in some sense the product of other disciplines having an impact on economics? The paper examines psychology’s impact on economics in connection with the emergence of behavioral development economics, and then discusses the nature of behavioral development economics imperialism associated with development economists’ explanations of non-market dimensions of life in developing economies in behavioral economics terms. The paper argues that this new form of economics imperialism reflects economics’ selective appropriation from psychology of the Kahneman-Tversky heuristics and biases view of...