The article contains the analysis of methodological changes and some key achievements in theoretical economics during the last fifty years. It is argued that the task, set up in a number of classical treatises, namely - to build the economic theory by the pattern of physics, probably can not be fulfilled. Empirical studies do not reveal fundamental economic laws. The development of the theory entailed the proofs of a number of theorems about impossibility to answer the most important questions in the framework of the widely accepted postulates. Many results are unstable with respect to "small variations" in constructions of economic models. These and a number of other observations force us to conclude that, despite the impressive progress, economic theory experiences a deep and long drawn-out crisis that has to experience a revision of its goals and changes in the organisation of the research.