|
Divine Coincidence
In economics, divine coincidence refers to the property of New Keynesian models that there is no trade-off between the stabilization of inflation and the stabilization of the welfare-relevant output gap (the gap between actual output and efficient output) for central banks. This property is attributed to a feature of the model, namely the absence of ''real'' imperfections such as real wage rigidities. Conversely, if New Keynesian models are extended to account for these real imperfections, divine coincidence disappears and central banks again face a trade-off between inflation and output gap stabilization. The definition of divine coincidence is usually attributed to the seminal article by Olivier Blanchard and Jordi Galí in 2007. Model In a standard New Keynesian model consisting of a Calvo price and sticky wages on the supply side and both a Keynes–Ramsey rule and the Taylor rule on the demand side, the so-called New Keynesian Phillips curve (NKPC) is the following: :\pi_ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Economics
Economics () is the social science that studies the production, distribution, and consumption of goods and services. Economics focuses on the behaviour and interactions of economic agents and how economies work. Microeconomics analyzes what's viewed as basic elements in the economy, including individual agents and markets, their interactions, and the outcomes of interactions. Individual agents may include, for example, households, firms, buyers, and sellers. Macroeconomics analyzes the economy as a system where production, consumption, saving, and investment interact, and factors affecting it: employment of the resources of labour, capital, and land, currency inflation, economic growth, and public policies that have impact on these elements. Other broad distinctions within economics include those between positive economics, describing "what is", and normative economics, advocating "what ought to be"; between economic theory and applied economics; between ratio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Keynesian Economics
New Keynesian economics is a school of macroeconomics that strives to provide microeconomic foundations for Keynesian economics. It developed partly as a response to criticisms of Keynesian macroeconomics by adherents of new classical macroeconomics. Two main assumptions define the New Keynesian approach to macroeconomics. Like the New Classical approach, New Keynesian macroeconomic analysis usually assumes that households and firms have rational expectations. However, the two schools differ in that New Keynesian analysis usually assumes a variety of market failures. In particular, New Keynesians assume that there is imperfect competition in price and wage setting to help explain why prices and wages can become "sticky", which means they do not adjust instantaneously to changes in economic conditions. Wage and price stickiness, and the other market failures present in New Keynesian models, imply that the economy may fail to attain full employment. Therefore, New Keynesians ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wage Rigidity
In macroeconomics, rigidities are real prices and wages that fail to adjust to the level indicated by equilibrium or if something holds one price or wage fixed to a relative value of another. Real rigidities can be distinguished from nominal rigidities, rigidities that do not adjust because prices can be sticky and fail to change value even as the underlying factors that determine prices fluctuate. Real rigidities, along with nominal, are a key part of new Keynesian economics. Economic models with real rigidities lead to nominal shocks (like changes in monetary policy) having a large impact on the economy. In the product market Real price rigidity can result from several factors. First, firms with market power can raise their mark-ups to offset declines in marginal cost and maintain a high price. Search costs can contribute to real rigidities through "thick market externalities". A thick market has many buyers and sellers, so search costs are lower. Thick markets can be expecte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olivier Blanchard
Olivier Jean Blanchard (; born December 27, 1948) is a French economist and professor who is a senior fellow at the Peterson Institute for International Economics. He was the chief economist at the International Monetary Fund from September 1, 2008, to September 8, 2015. Blanchard was appointed to the position under the tenure of Dominique Strauss-Kahn; he was succeeded by Maurice Obstfeld. He is also a Robert M. Solow Professor of Economics emeritus at the Massachusetts Institute of Technology (MIT). According to IDEAS/RePEc, he is one of the most cited economists in the world. Career Blanchard graduated from ESCP in 1970. From 1970 to 1973, he completed graduate level courses in economics and applied mathematics at Paris Dauphine University and Paris Nanterre University. He obtained a PhD in economics from MIT in 1977 and then taught at Harvard University between 1977 and 1983, after which time he returned to MIT as a professor. His areas of expertise in macroeconomics a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jordi Galí
Jordi Galí (born January 4, 1961) is a Spanish macroeconomist who is regarded as one of the main figures in New Keynesian macroeconomics today. He is currently the director of the Centre de Recerca en Economia Internacional (CREI, the Center for Research in International Economics) at Universitat Pompeu Fabra and a Research Professor at the Barcelona Graduate School of Economics. After obtaining his doctorate from MIT in 1989 under the supervision of Olivier Blanchard, he held faculty positions at Columbia University and New York University before moving to Barcelona. Research contributions Galí's research centers on the causes of business cycles and on optimal monetary policy, especially through the lens of time series analysis. His studies with Richard Clarida and Mark Gertler suggest that monetary policy in many countries today resembles the Taylor rule, whereas the policy makers of the 1970s failed to follow the Taylor rule. Another theme of Galí's research is how ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nominal Rigidity
Nominal rigidity, also known as price-stickiness or wage-stickiness, is a situation in which a nominal price is resistant to change. Complete nominal rigidity occurs when a price is fixed in nominal terms for a relevant period of time. For example, the price of a particular good might be fixed at $10 per unit for a year. Partial nominal rigidity occurs when a price may vary in nominal terms, but not as much as it would if perfectly flexible. For example, in a regulated market there might be limits to how much a price can change in a given year. If one looks at the whole economy, some prices might be very flexible and others rigid. This will lead to the aggregate price level (which we can think of as an average of the individual prices) becoming "sluggish" or "sticky" in the sense that it does not respond to macroeconomic shocks as much as it would if all prices were flexible. The same idea can apply to nominal wages. The presence of nominal rigidity is an important part of macr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keynes–Ramsey Rule
In macroeconomics, the Keynes–Ramsey rule is a necessary condition for the optimality of intertemporal consumption choice. Usually it is express as a differential equation relating the rate of change of consumption with interest rates, time preference, and (intertemporal) elasticity of substitution. If derived from a basic Ramsey–Cass–Koopmans model, the Keynes–Ramsey rule may look like :\dot(t) = \frac \cdot (r - \rho) \cdot c(t) where c(t) is consumption and \dot(t) its change over time (in Newton notation), \rho \in (0,1) is the discount rate, r \in (0,1) is the real interest rate, and \sigma > 0 is the (intertemporal) elasticity of substitution. The Keynes–Ramsey rule is named after Frank P. Ramsey, who derived it in 1928, and his mentor John Maynard Keynes, who provided an economic interpretation. Mathematically, the Keynes–Ramsey rule is a necessary first-order condition for an optimal control problem, also known as an Euler–Lagrange equation. See also * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taylor Rule
The Taylor rule is a monetary policy targeting rule. The rule was proposed in 1992 by American economist John B. Taylor for central banks to use to stabilize economic activity by appropriately setting short-term interest rates. The rule consider the federal funds rate, the price level and changes in real income.John B. Taylor, Discretion versus policy rules in practice (1993), Stanford University, y, Stanford, CA 94905 The Taylor rule computes the optimal federal funds rate based on the gap between the desired (targeted) inflation rate and the actual inflation rate; and the output gap between the actual and natural output level. According to Taylor, monetary policy is stabilizing when the nominal interest rate is higher/lower than the increase/decrease in inflation. Thus the Taylor rule prescribes a relatively high interest rate when actual inflation is higher than the inflation target. In the United States, the Federal Open Market Committee controls monetary policy. The committe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phillips Curve
The Phillips curve is an economic model, named after William Phillips (economist), William Phillips hypothesizing a correlation between reduction in unemployment and increased rates of wage rises within an economy. While Phillips himself did not state a linked relationship between employment and inflation, this was a trivial deduction from his statistical findings. Paul Samuelson and Robert Solow made the connection explicit and subsequently Milton Friedman and Edmund Phelps put the theoretical structure in place. While there is a short run tradeoff between unemployment and inflation, it has not been observed in the long run.Chang, R. (1997"Is Low Unemployment Inflationary?" ''Federal Reserve Bank of Atlanta Economic Review'' 1Q97:4-13 In 1967 and 1968, Friedman and Phelps asserted that the Phillips curve was only applicable in the short-run and that, in the long-run, inflationary policies would not decrease unemployment. Friedman then correctly predicted that in the 1973–75 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greg Mankiw
Nicholas Gregory Mankiw (; born February 3, 1958) is an American macroeconomist who is currently the Robert M. Beren Professor of Economics at Harvard University. Mankiw is best known in academia for his work on New Keynesian economics. Mankiw has written widely on economics and economic policy. , the RePEc overall ranking based on academic publications, citations, and related metrics put him as the 45th most influential economist in the world, out of nearly 50,000 registered authors. He was the 11th most cited economist and the 9th most productive research economist as measured by the h-index. In addition, Mankiw is the author of several best-selling textbooks, writes a popular blog,For Greg Mankiw's blog, see and has since 2007 written approximately monthly for the Sunday business section of ''The New York Times.'' According to the Open Syllabus Project, Mankiw is the most frequently-cited author on college syllabi for economics courses. Mankiw is a conservative and has bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Covariance
In probability theory and statistics, covariance is a measure of the joint variability of two random variables. If the greater values of one variable mainly correspond with the greater values of the other variable, and the same holds for the lesser values (that is, the variables tend to show similar behavior), the covariance is positive. In the opposite case, when the greater values of one variable mainly correspond to the lesser values of the other, (that is, the variables tend to show opposite behavior), the covariance is negative. The sign of the covariance therefore shows the tendency in the linear relationship between the variables. The magnitude of the covariance is not easy to interpret because it is not normalized and hence depends on the magnitudes of the variables. The normalized version of the covariance, the correlation coefficient, however, shows by its magnitude the strength of the linear relation. A distinction must be made between (1) the covariance of two ran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
