Monetary disequilibrium theory is a product of the Monetarist school and is mainly represented in the works of Leland Yeager and Austrian macroeconomics. The basic concept of monetary equilibrium (disequilibrium) was, however, defined in terms of an individual's demand for cash balance by Mises (1912) in his Theory of Money and Credit. Monetary disequilibrium is one of three theories of macroeconomic fluctuations which accord an important role to money, the others being the Austrian theory of the business cycle and one based on rational expectations.