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Macroeconomics(Macro economy,British: macroeconomics) IsEconomicsIt focuses on the entire national economy, which is a compilation of individual economic activities.MacroeconomicsOrMacroscopic economicsAlso translated as.
Focusing on the determination and fluctuation of macroeconomic variables,National income-Unemployment rate-inflation-investment-TradeThere is a total amount such as income and expenditure.Also subject to macroeconomic analysisMarketIt is,Product(Goods-Services)market,currency(capital-Bond)market,The laborDivided into markets.
The opposite language focuses on the individual actors that make up the economy.Microeconomics..Norwegian economists first devised the dichotomy between macroeconomics and microeconomicsRagnar Frisch.. Dutch economists first used the terms "microeconomics" and "macroeconomics"Wolf..The birth of macroeconomics was in 1936John Maynard Keynes(Keynesian economics)'S book "General theory of employment, interest and money』Starts with..In university education, the basic contents of microeconomics and macroeconomics are first learned.
According to the neoclassical school, the natural rate of interest is determined in the capital market.Production isSay's LawByWalrasbalancedHas been believed to be at a natural level to be achieved, but in the 1930s米 国StruckpanicCreates skepticism about this view.
Keynes and Kalecki
In the midst of this skepticism, John Maynard Canes published "The General Theory of Employment, Interest and Money" in 1936.KeynesLiquidity preferenceとMoney supplyBy realityInterest rateWas decided.For the future不 確 実 性Determined from the expected rate of profit (marginal efficiency of capital) and interest rate derived from long-term expectations withinvestmentとsavings OfbalancedDetermines the actual production level (gross national product, national income).Keynes rejected the classical claim that imbalances derive from price rigidity and theirSay's LawDeniedPrinciple of effective demandTo bridge the gap between the natural production level and the actual production level based onEffective demandHe appealed for the need for policy.It is said that this claim overturns the neoclassical economic system that had been established by accepting Say's law until then.Keynesian RevolutionHappens.
Michał KaleckiIs homeland earlier than KeynesPolandHe came up with the same idea as Keynes and wrote a Polish research treatise (1933, 1935), but thesePolishとFrenchAlready published because it was published onlyEnglishAt that time, few people at the economic society, which was the mainstream, realized the revolutionary value of this research treatise, and the 1935 article was Flysch.Jan TimbergenlikeStockholm SchoolWas evaluated.Later, when Keynes's above book was published in 1936, he published a new treatise (1936) in the form of commentary on it, and the various concepts that Keynes presented had already been published several years ago. It points out that it is the same as.
after thatPaul Samuelson,John HicksBy Keynesian interpretation of the United StatesNeoclassical synthesisWas established, and Keynes's model came to be understood as a special case of the classical general equilibrium model in the short term when prices were rigid (although this American Keynesian interpretation is based on the system of general theory and the amount of employment Some Post-Keynesians, who saw it as a system of long-term imbalances constrained by people's expectations, have also been evaluated as profane Keynesian).
In principle in the following descriptionKeynesian Economics = American Keynesian Theoretical SystemIt is assumed that it means.
However, in the 1970s, the United States, etc.Industrialized countries StagflationKeynes criticism occurs when he begins to suffer from.The neoclassical reinstatement brings attention to the idea of a new classical school.
New classicalOne of the other factors that is emerging isKeynesian economicsIs required to have been thought to have a methodological problem.A major feature of Keynesian economics is that macroeconomic variables such as total consumption are determined by a mechanism that is completely different from the optimization behavior of each economic agent envisioned in microeconomics.This divergence between the rational behavior of each economic agent and the determination of macroeconomic variables as a whole can be a problem when considering the suitability of macroeconomic models to reality.For example, Keynesian economics tends to treat variables that are originally determined endogenously by changes in the economic environment as parameters that are given exogenously and cannot be explained by the model.An example is shown below.
The rate of change in consumption with respect to income changes is called the marginal propensity to consume. In Keynesian economics, the marginal propensity to consume is a certain parameter defined by the current consumption / savings determination behavior.By the way, if a household is rational and optimizes over time, it will make different consumption decisions depending on whether the change in income is temporary or permanent.In other words, if we predict that income changes will be temporary and will return to their original levels in the next fiscal year, we will increase savings for future consumption without increasing consumption much at this time.Conversely, if we predict that income changes will be permanent, we should direct all income increments to current consumption.As a result, if households are rational, marginal propensity to consume is an endogenous variable, not an exogenous parameter, that changes with predictions about the nature of income change.An economic entity that seeks rational and timely optimization in this way makes predictions for the future and determines optimal actions based on it.In Kaines economicsExpectationIs not possible to weave in, so it is evaluated that endogenous variables are mistakenly treated as exogenous parameters.[Annotation 1].
In addition, Keynesian economics failed to factor in the expectations of economic agents, so macrosEconomic policyThere was also a problem with the evaluation method of.In other words, since the behavior of economic agents has been estimated using past data and the policies to be adopted in the future have been evaluated based on the estimation, it is not possible to incorporate changes in the behavior of economic agents in response to policy changes, making appropriate evaluation difficult. It was.Robert LucasCriticized that traditional macroeconomics did not consider the expectations of agents, and pointed out that current policy changes could change the behavior of agents as they affect their expectations of the future.Lucas criticized traditional Keynesian economics methodologies and emphasized the role played by the expectations of economic agents, but this criticism is associated with him.Lucas critiqueIt is called.
Lucas et al. Not only criticized traditional Keynesian economics, but also played a major role in building macroeconomics with microfoundations.The new macroeconomics established by Lucas et al. Is what is called the new classical macroeconomics.Ecologists, who are positioned in the new classical trend, have aggregated the behavior of these economic actors using a model that is strictly based on rational economic entity optimization behavior in order to explicitly handle people's expectations. I tried to analyze the macro economy as a thing.The typical exampleRepresentative individualIt is a model.By the way, the rational economic entity optimization behavior behind the model is what microeconomics envisions.Therefore, the new classical macroeconomics is said to have a microfoundation.He also emphasized the hypothesis that economic agents act with predictions that are consistent with the economic structure, so the early new classical school is sometimes called the rational expectation school.
In addition, the new classical schoolEconometricsEmphasis is placed on the method of empirically verifying the model using.They were accompanied by intertemporal optimization of consumption (Ramsey・ Short-term based on the model)Business cycleAs a model to explainReal business cycle modelAt the same time, we introduced a calibration that compares the predicted values derived from the model with the actual data.
On the other hand, on the Keynesian economics side, there was a movement corresponding to the new classical school.New KeynesianMacroeconomics has embraced the micro-preconditions of the new classical school and has built new models to give Keynesian economics a micro-foundation.Along with that, we also accepted the rational expectation hypothesis in order to assume rationality in the sense of optimizing over time.New Keynesian, like the new classicals, emphasizes the role of economic agents' expectations.Nominal on itPriceThe model incorporates elements that characterize the American Keynesian, such as the stickiness of.
As an exampleSearch theoryThere is a modeling that applies.Search theory is a model of the behavior of a seller and a buyer looking for a trading partner, and if they can find a trading partner successfully, they make a direct bilateral transaction.If you turn it over, the transaction will not be completed unless you find a trading partner.In search theory, sellers and buyers come together to trade on the price signal.WalrasIt models a trading environment that is completely different from the typical market environment.This is because in a Walras-like market, economic agents only come into contact through price.Multiple different yields in this modelbalancedAppears.A high-yield equilibrium corresponds to a boom, and a low-yield equilibrium corresponds to a recession.Which equilibrium will be achieved depends on the expectations of economic agents regarding the outlook for search activity.That is, a balance of high output is realized if the possibility of closing a transaction is predicted, and a balance of low output is realized if the possibility of closing is low.
In this way, New Keynesian has something in common with the new classical school in that it emphasizes the expectations of economic agents while modeling a different trading environment from the Walras market, unlike the new classical school.
Attempt to fuse the two
In recent years, a common soil has been found between the new classical and New Keynesian.Both have a common understanding that macroeconomics requires a micro-foundation and that the expectations of economic agents play a major role.Based on this common understanding, both partiesA common model called a model is used.Such trends are evaluated as moving toward building a framework for unified analysis of macroeconomic phenomena such as short-term business cycles and long-term economic growth.This microfoundation of macroeconomics makes it difficult to make a strict distinction between microeconomics and macroeconomics.
New Keynesian is the optimal growth model used by the new classical schoolReal business cycle theoryStarting from, we are trying to give Keynesian economics a micro-foundation by adding some assumptions to them.
Even the new classical school is like the traditional WalrasPerfect competitionThere is a movement to loosen market assumptions.Some of them when building a modelExternalityAnd incomplete information, and evenEconomy of scale,Exclusive competitionSome people take in.The typical example is.
However, for the new macroeconomics that emphasizes these microfoundations, Keynes inherited the classical dichotomy of Keynesian, which is in opposition to the classical school that accepts Say's law.Post KeynesianThere are sharp criticisms from people of the school called.However, under the circumstances where the new classical and New Keynesian, which are also mainstream in number, are close in accepting micro-preconditions, the dichotomy of classical and Keynesian is at least recent macroeconomics. It is evaluated that it does not have as much meaning as before in grasping the trend of.
|18C||Classicism||Say's lawSupply creates demand by price elastic market||David Ricardo,Adam Smith,John Stuart Mill|
|19C||Neoclassical||Full employment is always established in Walras equilibrium achieved by price adjustment||Leon Walras,Wilfred Pareto|
|1930s||KeynesとKalecki||Effective demandPrice-rigid market where demand creates supply by principle||John Maynard Keynes,Michał Kalecki|
(Neo Kane Theanism)
|Attempt to comparative static formulation of Keynesian theory||John Hicks,Paul Samuelson|
|1970s||Supply cider||Criticism of Keynesian demand-creating fiscal policy by Say's law||Robert Mandel|
|1970s||Monetarist||Keynesian monetary policy is long-term invalid due to classical dichotomy||Milton Friedman|
|1970s||Fully foreseen Keynesian monetary policy is short-term and long-term invalid||Robert Lucas|
(The name is from 1975)
|The essence of Keynesian theory is dynamic imbalance|
Attempt of dynamic formulation focusing on the irrationality of "long-term expectations" as the factor
(Conflict with rational expectations school)
|In a broad senseMichał Kalecki,Joan Robinson,Clown sluffer,Hyman Minsky,|
Paul Davidson,Nicholas Kaldor,Hirofumi Uzawaな ど
|There is no price rigidity and Walras equilibrium is always established||Edward Prescott|
|1990s||New Cane The Anism||Microfoundations for price rigidity||Gregory Mancu,Joseph Stiglitz,Kiyotaki Nobuhiro|
The Keynesian Revolution created two major disruptions to macroeconomic views.The following is a summary of the important differences between the traditional and neoclassical economic views and the Keynesian economic view.
|Real economic view||Classical / Neoclassical||Keynes|
|生産||Natural rate production level||Real production level|
|unemployment||Full employment (natural rate of unemployment)||Underemployment unemployment rate|
|currency||No effect on real variables due to price elasticity|
⇔ Classical dichotomy / quantity theory of money
|Affects real variables due to price rigidity|
|interest||Capital market (investment, savings, supply and demand)|
⇒ Natural rate of interest
|Money market (money supply and demand) ⇔ Liquidity preference theory|
⇒ Real interest rate
|need||Utility maximization solution under Walras's law (budget constraint)||Simultaneous solution of product market system and money market system|
|Supply||Profit maximization and cost minimization solutions||Models on the labor market|
The table below shows the views of each theory on macroeconomic policy.This table is quoted from page 503 of "Krugman Macroeconomics".
|Is Expanded Monetary Policy Effective in Overcoming the Depression?||×||Almost ×[Annotation 2]||○||Special situation (Liquidity trap) Except ○|
|Is Fiscal Policy Effective in Overcoming the Depression?||×||○||×||○|
|Are monetary or fiscal policies effective in reducing long-term unemployment?||×||○||×||×|
|Should Fiscal Policy Operate Discretionarily?||×||○||×||Except for special circumstances ×|
|Should monetary policy be managed discretionarily?||×||○||×||In dispute|
- National accounts
- Keynes emphasized the connections between macro variables to facilitate analysis.
- National income The It is represented by the national income identity.
- The above formula is from left to rightincome,消费,investment(Including inventory investment), government spending, and net exports (exports minus imports).
- It is assumed that national income in terms of income, production, and distribution is the same.Three-sided equivalentIs established.
- Regarding consumption and investment among macro variablesConsumption function,Investment functionThere are various discussions about.
- General equilibrium analysis under a closed economy
- IS-LM modelからDemand functionIs guided.
- Labor marketThe supply function is derived from the analysis.There are models such as a worker error model, an incomplete information model, and a rigid wage model, and the supply function based on the incomplete information model advocated by Lucas is called the Lucas-type supply function.
- IS-LM analysis is often regarded as short-term, and aggregate demand and supply (AD-AS) analysis is often regarded as long-term.This implication is that while the Keynesian view of the economy is effective in the short term, the shock on the demand side is not predictable by the total supply and demand analysis that also considers the supply side.
- General equilibrium analysis under an open economy
- A general equilibrium analysis under an open economy is called an international macroeconomic analysis.
- A simple policy analysis can be made by IS-LM analysis under a small country open economy, which makes a simple assumption that the interest rate is fixed at the world interest rate, which is called the Mundell-Fleming model. IS-LM analysis has been applied in various ways to the open economy, such as the IS-LM-BP analysis, which adds a current balance curve.
- The asset approach in exchange rate decision theory is Keynesian analysis.
- Economic growth theory
- Under KeynesHarrod,DormerThe growth theory advocated by Keynesian is Keynesian's theory of economic growth.
- Taking over the trend of Keynesian economics that emphasizes market imperfections, he insists on the knife edge theorem that when the actual growth rate deviates from the guaranteed growth rate, the dissociation diverges.
- General equilibrium analysis under a closed economy
- Marshall's demand function is derived from the consumer utility maximization problem, and Hicks' compensation demand function is derived from the spending minimization problem.The sum of these individual consumer demand functions is the aggregate demand function.
- The supply function is derived from the problem of maximizing the profit of a company.The sum of the supply functions of these individual firms is the aggregate supply function.Demand shock does not make sense because the supply function is vertical in the long run.
- New classical
- General equilibrium macrodynamic modelCarriage is performed by a Ramsey model called.This gives the Thoreau model a microfoundation such as the consumption function derived from the utility maximization problem.
- General equilibrium analysis under an open economy
- Purchasing power parity theory, that is, the monetary approach, is a classical analysis in the theory of exchange rate determination.
- Economic growth theory
- Called the Thoreau modelThoreauThe neoclassical growth theory advocated by is a popular theory.This incorporates the concept of production function and difference into the national income identity.
- ^ Keynes himself, in that general theory,消费He has covered a wide range of factors that affect consumption, and he knew that changes in expectations about current and future income level movements would affect consumption, but the short-term effects are secondary. I thought I had only sex
- ^ It means "only with expansionary monetary policy ...".