no trade-off exploitable by economic policy. Lucas' intention was to prove that the Phillips curve exists without existing. It has been a heritage that there is a trade-off between inflation and unemployment or real economic performance, so it is undoubted that there is a short run Phillips curve (or there are short run Phillips curves). Although there are fewer possible actions available for the monetary policy to conceit people in order to increase the labour supply, unexpected changes can always trigger real changes. But what is the ultimate purpose of the central bank when changing the money supply? For example, and mostly: exerting countercyclical control. Doing so, monetary policy would increase the money supply in order to eliminate the negative effects of an unfavourable macroeconomic shock. However, monetary policy is not able to utilize the trade-off between inflation and real economic performance, because there is no information available in advance about the shocks to eliminate. Under these conditions, the central bank is unable to plan a course of action, that is, a countercyclical monetary policy. Rational agents can be conceited only by unexpected changes, so a well-known economic policy is completely in vain. However, and this is the point, the central bank cannot outline unforeseeable interventions in advance, because it has no informational advantage over the agents. The central bank has no information about what to eliminiate through countercyclical actions. The trade-off between inflation and unemployment exists, but it cannot be utilized by the monetary policy for countercyclical purposes. The New Keynesian research program in particular emphasizes models in which money is not neutral in the short run, and therefore monetary policy can affect the real economy. Post-Keynesian economics and monetary circuit theory reject the neutrality of money, instead emphasizing the role that bank lending and credit play in the creation of bank money. Post-Keynesians also emphasize the role that nominal debt plays: since the nominal amount of debt is not in general linked to inflation, inflation erodes the real value of nominal debt, and deflation increases it, causing real economic effects, as in debt-deflation. Reasons for departure from superneutrality Even if money is neutral, so that the level of the money supply at any time has no influence on real magnitudes, money could still be non-superneutral: the growth rate of the money supply could affect real variables. A rise in the monetary growth rate, and the resulting rise in