CHAPTER 27 Epilogue: The Story of Macroeconomics CHAPTER 27 Prepared by: Fernando Quijano and Yvonn Quijano Epilogue: The Story of Macroeconomics Copyright.
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In the process of deriving effective demand, Keynes introduced many of the building blocks of modern macroeconomics:
The relation of consumption to income, and the multiplier.
Liquidity preference (the term given to the demand for money).
The importance of expectations in affecting consumption and investment; and the idea that animal spirits are a major factor behind shifts in demand and output.
Paul Samuelson wrote the first modern economics textbook: Economics
The neoclassical synthesis refers to a large consensus that emerged in the early 1950s, based on the ideas of Keynes and earlier economists.
The neoclassical synthesis was to remain the dominant view for another 20 years. The period from the early 1940s to the early 1970s was called the golden age of macroeconomics.
In the 1950s, Franco Modigliani and Milton Friedman independently developed the theory of consumption, and insisted on the importance of expectations.
Modigliani
Tobin
James Tobin developed the theory of investment based on the relation between the present value of profits and investment. Dale Jorgenson further developed and tested the theory.
Progress on All Fronts
Theories of Consumption, Investment, and Money Demand
Milton Friedman was the intellectual leader of the monetarists, and the father of the theory of consumption.
He believed that the understanding of the economy remained very limited, and questioned the motives and ability of governments to improve macroeconomic outcomes.
Friedman challenged the view that fiscal policy could affect output faster and more reliably than monetary policy.
In a 1963 book, A Monetary History of the United States, 1867-1960, Friedman and Anna Schwartz reviewed the history of monetary policy and concluded that monetary policy was not only very powerful, but that movements in money also explained most of the fluctuations in output.
They interpreted the Great Depression as the result of major mistake in monetary policy.
The Phillips curve had become part of the Neoclassical synthesis, but Milton Friedman and Edmund Phelps argued that the apparent trade-off between unemployment and inflation would quickly vanish if policy makers actually tried to exploit it.
By the mid 1970s, the consensus was that there was no long-run trade off between inflation and unemployment.
Skeptical that economists knew enough to stabilize output, and that policy makers could be trusted to do the right thing, Milton Friedman argued for the use of simple rules, such as steady money growth.
Friedman believed that political pressures to “do something” in the face of relatively mild problems may do more harm than good.
Robert Lucas argued that macroeconomic models did not incorporate expectations explicitly; that the models captured relations as they had held in the past, under past policies. They were poor guides to what would happen under new policies.
This critique of macroeconometric models became known as the Lucas Critique.
In Keynesian models, the slow return of output to the natural level of output came from the slow adjustment of prices and wages through the Phillips curve mechanism. Within the logic of the Keynesian models, Lucas therefore argued, only unanticipated changes in money should affect output.
The intellectual atmosphere in macroeconomics was tense in the early 1970s. But within a few years, a process of integration (of ideas, not people, because tempers remained high) had begun, and it was to dominate the 1970s and the 1980s.
Work then started on the challenges raised by Lucas and Sargent.
Robert Hall showed that if consumers are very foresighted, then changes in consumption should be unpredictable.
Consumption will change only when consumers learn something new about the future. Since news about the future cannot be predicted, changes in consumption are highly random. This consumption behavior, known as the random walk of consumption, has served as a benchmark in consumption research ever since.
Rudiger Dornbusch developed a model of exchange rates that shows how large swings in exchange rates are not the result of irrational speculation but, instead, fully consistent with rationality.
Dornbusch’s model, known as the overshooting model of exchange rates, has become the benchmark in discussions of exchange-rate movements.
Stanley Fischer and John Taylor showed that the adjustment of prices and wages in response to changes in unemployment can be slow even under rational expectations.
They pointed to the staggering of both wage and price decisions, and explained how a slow return of output to the natural level can be consistent with rational expectations in the labor market.
New Classical Economics and Real Business Cycle Theory
Their real business cycle (RBC) models assume that output is always at its natural level, and fluctuations are movements of the natural level of output. These movements are fundamentally caused by technological progress.
Edward Prescott is the intellectual leader of the new classicals—a group of economists interested in explaining fluctuations as the effects of shocks in competitive markets with fully flexible prices and wages.
One line of research focuses on the determination of wages in the labor market. George Akerlof has explored the role of “norms,” or rules that develop in any organization to assess what is fair or unfair.
The new Keynesians are a loosely connected group of researchers working on the implications of several imperfections in different markets.
Yet another direction of research is nominal rigidities in wages and prices. The menu cost explanation of output fluctuations, developed by Akerlof and N. Gregory Mankiw, attributes even small costs of changing prices to the infrequent and staggered price adjustment.
Another line of new Keynesian research has explored imperfections in credit markets. Ben Bernanke has studied the relation between banks and borrowers and its effects on monetary policy.
New growth theory focuses on the determinants of technological progress in the long run, and the role of increasing returns to scale.
Robert Lucas and Paul Romer have provided a new set of contributions under the name of new growth theory, which take on some of the issues initially raised by growth theorists of the 1960s.
One example of some of the advances economists have made is on the work of Philippe Aghion and Peter Howitt. They have developed a theme first explored by Joseph Schumpeter in the 1930s, the notion that growth is a process of creative destruction, in which new products are constantly introduced, making old ones obsolete.
Andrei Shleifer (from Harvard University) has explored the role of different legal systems in affecting the organization of the economy, from financial markets to labor markets, and, through these channels, the effects of legal systems on growth.
Daron Acemoglu (from MIT) has explored how to go from correlations between institutions and growth— democratic countries are on average richer—to causality from institutions to growth
Woodford, Gali, and a number of co-authors have developed a model, known as the New-Keynesian model, that embodies utility and profit maximization, rational expectations, and nominal rigidities.
This model has proven extremely useful and influential in the redesign of monetary policy. It has also led to the development of a class of larger models that build on its simple structure, but allow for a longer menu of imperfections and thus must be solved numerically.
These models, which are now used in most central banks, are known as dynamic stochastic general equilibrium (DSGE) models.
The length of the “short run,” the period of time over which aggregate demand affects output.
The role of policy. Those who believe that output returns quickly to the natural level advocate the use of tight rules on both fiscal and monetary policy. Those who believe that the adjustment is slow prefer more flexible stabilization policies.
business cycle theory effective demand liquidity preference neoclassical synthesis Keynesians Monetarists Lucas critique random walk of consumption staggering (of wage and price
decisions)
new classicals real business cycle (RBC) models new Keynesians nominal rigidities menu cost new growth theory New-Keynesian model DSGE models (dynamic