The term "post-Keynesian" was first used to refer to a distinct school of economic thought by
Eichner and Kregel (1975) and by the establishment of the
Journal of Post Keynesian Economics in 1978. Prior to 1975, and occasionally in more recent work,
post-Keynesian could simply mean economics carried out after 1936, the date of Keynes's
General Theory. Post-Keynesian economists are united in maintaining that Keynes' theory is seriously misrepresented by the two other principal Keynesian schools:
neo-Keynesian economics, which was orthodox in the 1950s and 60s, and
new Keynesian economics, which together with various strands of
neoclassical economics has been dominant in mainstream
macroeconomics since the 1980s. Post-Keynesian economics can be seen as an attempt to rebuild economic theory in the light of Keynes' ideas and insights. However, even in the early years, post-Keynesians such as Joan Robinson sought to distance themselves from Keynes, and much current post-Keynesian thought cannot be found in Keynes. Some post-Keynesians took a more progressive view than Keynes himself, with greater emphases on worker-friendly policies and redistribution. Robinson, Paul Davidson and
Hyman Minsky emphasized the effects on the economy of practical differences between different types of investments, in contrast to Keynes' more abstract treatment. The theoretical foundation of post-Keynesian economics is the
principle of effective demand that demand matters in the long as well as the short run, so that a competitive market economy has no natural or automatic tendency towards
full employment. Contrary to the views of new Keynesian economists working in the neoclassical tradition, post-Keynesians do not accept that the theoretical basis of the market's failure to provide full employment is rigid or
sticky prices or wages. Post-Keynesians typically reject the
IS–LM model of
John Hicks, which is very influential in neo-Keynesian economics, because they argue endogenous bank lending to be more significant than central banks' money supply for the interest rate. The contribution of post-Keynesian economics has extended beyond the theory of aggregate employment to theories of
income distribution, growth, trade and development in which money demand plays a key role, whereas in neoclassical economics these are determined by the forces of technology, preferences and endowment. In the field of monetary theory, post-Keynesian economists were among the first to emphasise that money supply responds to the demand for bank credit, so that a
central bank cannot control the quantity of money, but only manage the interest rate by managing the quantity of monetary reserves. This view has largely been incorporated into mainstream economics and
monetary policy, which now targets the interest rate as an instrument, rather than attempting to accurately control the quantity of money. In the field of finance, Hyman Minsky put forward a theory of financial crisis based on
financial fragility, which has received renewed attention. == Main features ==