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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 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.
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:
There was still a gap after the IS-LM-Phillips curve model became widely accepted as the unit of analysis in macroeconomic theory: putting numbers on variables like the marginal propensity to consume, the propensity to invest, or the sensitivity of money demand to interest rates, so that macroeconomic forecasts could be made or economic policy ...
Many researchers, such as Blanchard, Galí [1] or Mankiw [2] appear skeptical with regard to the existence of divine coincidence in the real world. This skepticism is mostly directed to the severely restrictive assumptions required for divine coincidence to exist in the NKPC model, most prominently the absence of real wage rigidities.
Conversely, Keynesians using the Phillips curve or cost-push inflation models of struggled to provide non-ad hoc explanations of stagflation and its different magnitudes across different countries, such as higher inflation in the United States and the United Kingdom than in Germany and Japan.
He also provided sound theoretical foundations to Milton Friedman and Edmund Phelps's view of the long-run neutrality of money, and provided an explanation for the then observed correlation between output and inflation, depicted by the Phillips curve, while illustrating that the existence of this empirical relationship did not yield a ...
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.