In 1933 Kalecki wrote "Próba teorii koniunktury" ('An Attempt at the Theory of the Business Cycle'), an essay that brought together many of the issues that dominated his thought for the rest of his life. In the essay Kalecki for the first time developed a comprehensive theory of business cycles. The foundations of his macroeconomic theory of effective demand presented in the paper anticipated similar ideas published three years later by John Maynard Keynes in "The General Theory of Employment, Interest and Money". According to Lawrence Klein (1951), Kalecki "created a system that contains everything of importance in the Keynesian system, in addition to other contributions". In an introduction to the essay's 1966 English translation, Joan Robinson wrote: "Its sharp and concentrated statement provides a better introduction to the general theory of employment, interest and money than any that has yet been produced."