The Keynesian theory was named after its founder, John Maynard Keynes (1883-1946), one of the great thinkers of the 20th century. Keynes was a student of Alfred Marshall at the University of Cambridge (where he later taught himself) and his teaching is under a certain influence of Marshall. He is the author of many economic works, which were intended to "save capitalism" and which were greatly influenced by the social and historical circumstances of that time. He was extremely educated and capable of economically analyzing and describing the reality and problems of the society in which he lived in a short period of time. Of his numerous works, the most significant is certainly: General theory of employment, interest and money. In that part, he summarizes and criticizes his earlier understandings, while developing his analysis (theory) in which the idea of effective search occupies a central place.
Dejan Gojkov (Wed,) studied this question.