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The Lucas islands model is an economic model of the link between money supply and price and output changes in a simplified economy using rational expectations.It delivered a new classical explanation of the Phillips curve relationship between unemployment and inflation.
In 2002, Mankiw and Ricardo Reis proposed an alternative to the widely-used New Keynesian Phillips curve that is based on the slow diffusion of information among the population of price setters. Their sticky-information model displays three related properties that are more consistent with accepted views about the effects of monetary policy.
The Phillips curve equation can be derived from the (short-run) Lucas aggregate supply function. The Lucas approach is very different from that of the traditional view. Instead of starting with empirical data, he started with a classical economic model following very simple economic principles. Start with the aggregate supply function:
One important application of the critique (independent of proposed microfoundations) is its implication that the historical negative correlation between inflation and unemployment, known as the Phillips curve, could break down if the monetary authorities attempted to exploit it.
Phillips was born at Te Rehunga near Dannevirke, New Zealand, to Harold Housego Phillips, a dairy farmer, and his wife, Edith Webber, a schoolteacher and postmistress. [1] A mechanical aptitude began to emerge at an early age: at fifteen, Bill learned how to fix a motor vehicle engine, how to wire a shed for electrical lighting, build radios, and create a crude form of cinematography.
Adaptive expectations were instrumental in the consumption function (1957) and Phillips curve outlined by Milton Friedman. Friedman suggests that workers form adaptive expectations of the inflation rate, the government can easily surprise them through unexpected monetary policy changes.
The New Keynesian Phillips curve was originally derived by Roberts in 1995, [48] and has since been used in most state-of-the-art New Keynesian DSGE models. [49] The new Keynesian Phillips curve says that this period's inflation depends on current output and the expectations of next period's inflation.
Olivier Blanchard in his textbook uses the term IS–LM–PC model (PC standing for Phillips curve). [3] Others, among them Carlin and Soskice, refer to it as the "three-equation New Keynesian model", [ 14 ] the three equations being an IS relation, often augmented with a term that allows for expectations influencing demand, a monetary policy ...