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Journal ArticleDOI

A monetary Minsky model of the Great Moderation and the Great Recession

01 Feb 2013-Journal of Economic Behavior and Organization (Elsevier)-Vol. 86, pp 221-235
TL;DR: In this article, a strictly monetary macroeconomic model was proposed to generate the monetary as well as the real phenomena manifested by both The Great Recession and The Great Moderation, which can generate both monetary and real phenomena.
Abstract: Steve Keen's model of Minsky's Financial Instability Hypothesis ( Keen, 1995 ) displayed qualitative characteristics that matched the real macroeconomic and income-distributional outcomes of the preceding and subsequent fifteen years: a period of economic volatility followed by a period of moderation, leading to a rise of instability once more and a serious economic crisis. This paper extends that model to build a strictly monetary macroeconomic model which can generate the monetary as well as the real phenomena manifested by both The Great Recession and The Great Moderation.

Summary (2 min read)

Introduction

  • The trend for recessions to become less frequent and milder abruptly gave way to a sharp decline in output, a doubling of unemployment, and a temporary fall into deflation.
  • The causes of this economic calamity will be debated for decades, but there should be little debate with the proposition that it was not predicted by any variant of mainstream economic analysis available at the time.

The Financial Instability Hypothesis—Genesis

  • These are questions that naturally follow from both the historical record and the comparative success of the past thirty-five years.
  • In addition to being based on unfamiliar theoretical and philosophical foundations, Minsky’s work has mainly been published in non-mainstream journals such as the Journal of Post Keynesian Economics and the Journal of Economic Issues, and minor journals such as the Nebraska Journal of Economics and Business.
  • The abstract model of the neoclassical synthesis cannot generate instability.

The Financial Instability Hypothesis—a Précis3

  • The cause of this high and universally practised risk aversion is the memory of a not too distant system-wide financial failure, when many investment projects foundered, many firms could not finance their borrowings, and many banks had to write off bad debts.
  • Such businesses will find themselves having to sell assets to finance their debt servicing—and this entry of new sellers into the market for assets pricks the exponential growth of asset prices.
  • As the boom collapses, the fundamental problem facing the economy is one of excessive divergence between the debts incurred to purchase assets, and the cash flows generated by them—with those cash flows depending both upon the level of investment and the rate of inflation.

Endogenous money

  • Though debt was modeled in the preceding system, money was not explicitly considered, and therefore price dynamics were absent.
  • There is no evidence that either the monetary base or M1 leads the cycle, although some economists still believe this monetary myth… if anything, the monetary base lags the cycle slightly….
  • From this he derived the proposition that banks, as the creators of these tokens, must be modeled as separate agents from firms and households, and that all transactions are single-commodity, monetary exchanges involving three agents: any monetary payment must therefore be a triangular transaction, involving at least three agents, the payer, the payee, and the bank.

Modeling Minsky III: Endogenous Money

  • There are 5 accounts in the basic model:6 1. A Bank Vault (BV) representing the banking sector’s monetary assets; 2. A Bank Transactions Account (BT) through which all expenditure and interest payments pass;7 3.
  • Payment of wages (row 7) 5. Payment of interest on workers’ account balances (row 8) 6.
  • Recording the endogenous creation of new money (row 13) One is the crucial step of endogenous money creation in response to the investment desires of firms (in this simple model, all capital expansion is shown as funded by borrowing money from the banking sector): 13.
  • The monetary functions are expressed as time constants9 whose value at any given time depends upon the rate of profit.
  • The wages share of output declines as debt levels rise, while the profit rate cycles around its equilibrium value before the final collapse (when exponential growth in the debt ratio means that bankers’ share of income explodes as income collapses).

Conclusion

  • Though much could be done to enhance its realism, in its present form it provides an explanation not only of the Great Recession, but also the Great Moderation that preceded it.
  • The fact that this model is relevant to today’s economic predicament vindicates Minsky’s stricture from 1982 that, if the authors are to fully comprehend how market economies really behave, “it is necessary to have an economic theory which makes great depressions one of the possible states in which their type of capitalist economy can find itself.”.

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A Monetary Minsky Model of the Great Moderation and
the Great Recession
Abstract
Steve Keen’s model of Minsky’s Financial Instability Hypothesis (Steve Keen, 1995) displayed
qualitative characteristics that matched the real macroeconomic and income-distributional
outcomes of the preceding and subsequent fifteen years: a period of economic volatility followed
by a period of moderation, leading to a rise of instability once more and a serious economic
crisis. This paper extends that model to build a strictly monetary macroeconomic model which
can generate the monetary as well as the real phenomena manifested by both “The Great
Recession” and “The Great Moderation”.
Introduction
The financial and economic crisis that began in 2007 brought to an abrupt end a period of
economic tranquility that many macroeconomists had celebrated as "The Great Moderation"
(Luca Benati and Paolo Surico, 2009, Ben S. Bernanke, 2004, Steven J Davis and James A Kahn,
2008, Jordi Gali and Luca Gambetti, 2009). The trend for recessions to become less frequent and
milder abruptly gave way to a sharp decline in output, a doubling of unemployment, and a
temporary fall into deflation.

Monetary Minsky Model of the Great Moderation and Great Recession
2
Figure 1:The Great Moderation gives way to the Great Recession
The causes of this economic calamity will be debated for decades, but there should be little
debate with the proposition that it was not predicted by any variant of mainstream economic
analysis available at the time. It was however a prediction of the non-mainstream "Financial
Instability Hypothesis" (FIH) developed by Hyman Minsky.
Steve Keen’s 1995 model of this hypothesis generated qualitative characteristics that matched
the real macroeconomic and income-distributional outcomes of the preceding and subsequent
fifteen years: a period of economic volatility followed by a period of moderation, leading to a
rise of instability once more and a serious economic crisis; and the wage share of income
declining while non-financial business incomes stabilised and financial sector earnings rose
(Steve Keen, 1995; 2000, p. 93). This model is acknowledged as the reason why Keen was one
of the handful of economists to anticipate and warn of the approaching economic and financial
crisis well before it actually occurred (Steve Keen 2007; Dirk J Bezemer, 2009, 2010; Edward
Fullbrook, 2010).
This paper extends that model to build a strictly monetary macroeconomic model of the FIH,
which can generate the monetary as well as the real qualitative characteristics of both “The Great
Recession” and “The Great Moderation” that preceded it. I begin with an overview of Minsky’s
1980 1985 1990 1995 2000 2005 2010 2015
5
2.5
0
2.5
5
7.5
10
12.5
15
Unemployment
Inflation
Unemployment and Inflation
Year
Percent
0

Monetary Minsky Model of the Great Moderation and Great Recession
3
Financial Instability Hypothesis, since many economists are unfamiliar with this non-
neoclassical integrated theory of macroeconomics and finance.
1
The language and concepts in Minsky's theory were also developed completely outside the
mainstream economic debate of the past 30 years,
2
and will therefore appear very foreign to
most macroeconomists today. I hope that readers can look past this unfamiliarity to apply the
spirit of Friedman's methodological dictum, that what matters is not the assumptions of a theory,
but its capacity to give accurate predictions (Milton Friedman, 1953).
The Financial Instability Hypothesis—Genesis
Minsky’s motivation for developing the Financial Instability Hypothesis was that, since the
Great Depression had occurred, a valid economic theory had to be able to generate such an
outcome as one of its possible states:
Can “It”—a Great Depression—happen again? And if “It” can
happen, why didn’t “It” occur in the years since World War II?
These are questions that naturally follow from both the historical
record and the comparative success of the past thirty-five years. To
answer these questions it is necessary to have an economic theory
which makes great depressions one of the possible states in which
our type of capitalist economy can find itself. (Hyman P. Minsky,
1982a, p. 5)
1
In addition to being based on unfamiliar theoretical and philosophical foundations, Minsky’s
work has mainly been published in non-mainstream journals such as the Journal of Post
Keynesian Economics and the Journal of Economic Issues, and minor journals such as the
Nebraska Journal of Economics and Business. Minsky has appeared only twice in the AER:
Hyman Minsky 1957 and 1971.
2
The evolution of Minsky’s hypothesis is discussed in detail in Steve Keen, 1995 and 2001.
Hyman Minsky, 1982b provides his most important papers (the introduction and Chapters 1-5
are sufficient). I also recommend Minsky 1975. His final book Stabilizing an Unstable Economy
Hyman Minsky, 1986, is a far less useful guide to his theories than these earlier works.

Monetary Minsky Model of the Great Moderation and Great Recession
4
For this reason, Minsky explicitly rejected neoclassical economics:
The abstract model of the neoclassical synthesis cannot generate
instability. When the neoclassical synthesis is constructed, capital
assets, financing arrangements that center around banks and money
creation, constraints imposed by liabilities, and the problems
associated with knowledge about uncertain futures are all assumed
away. For economists and policy-makers to do better we have to
abandon the neoclassical synthesis. (Hyman P. Minsky, 1982a, p.
5)
Minsky instead combined insights from Schumpeter, Fisher and Keynes to develop a theory of
financially-driven business cycles which can lead to an eventual debt-deflationary crisis.
The Financial Instability Hypothesis—a Précis
3
Minsky’s analysis of a financial cycle begins at a time when the economy is doing well (the rate
of economic growth equals or exceeds that needed to reduce unemployment), but firms are
conservative in their portfolio management (debt to equity ratios are low and profit to interest
cover is high), and this conservatism is shared by banks, who are only willing to fund cash-flow
shortfalls or low-risk investments. The cause of this high and universally practised risk aversion
is the memory of a not too distant system-wide financial failure, when many investment projects
foundered, many firms could not finance their borrowings, and many banks had to write off bad
debts. Because of this recent experience, both sides of the borrowing relationship prefer
extremely conservative estimates of prospective cash flows: their risk premiums are very high.
However, the combination of a growing economy and conservatively financed investment means
that most projects succeed. Two things gradually become evident to managers and bankers:
“Existing debts are easily validated and units that were heavily in debt prospered: it pays to
lever.” (Hyman P. Minsky, 1982a, p. 6). As a result, both managers and bankers come to regard
the previously accepted risk premium as excessive. Investment projects are evaluated using less
33
This summary of Minsky is reproduced from Steve Keen (1995) with the kind permission of
the Journal of Post Keynesian Economics.

Monetary Minsky Model of the Great Moderation and Great Recession
5
conservative estimates of prospective cash flows, so that with these rising expectations go rising
investment and asset prices. The general decline in risk aversion thus sets off both growth in
investment and exponential growth in the price level of assets, which is the foundation both of
the boom and its eventual collapse.
More external finance is needed to fund the increased level of investment and the speculative
purchase of assets, and these external funds are forthcoming because the banking sector shares
the increased optimism of investors (Hyman P. Minsky, 1982b, p. 65). The accepted debt to
equity ratio rises, liquidity decreases, and the growth of credit accelerates.
This marks the beginning of what Minsky calls “the euphoric economy” (Hyman P. Minsky,
1982b, p. 121), where both lenders and borrowers believe that the future is assured, and therefore
that most investments will succeed. Asset prices are revalued upward as previous valuations are
perceived to be based on mistakenly conservative grounds. Highly liquid, low-yielding financial
instruments are devalued, leading to a rise in the interest rates offered by them as their purveyors
fight to retain market share.
Financial institutions now accept liability structures both for themselves and their customers
“that, in a more sober expectational climate, they would have rejected” (Hyman P. Minsky,
1982b, pp. 120-125). The liquidity of firms is simultaneously reduced by the rise in debt to
equity ratios, making firms more susceptible to increased interest rates. The general decrease in
liquidity and the rise in interest paid on highly liquid instruments triggers a market-based
increase in the interest rate, even without any attempt by monetary authorities to control the
boom. However the increased cost of credit does little to temper the boom, since anticipated
yields from speculative investments normally far exceed prevailing interest rates, leading to a
decline in the elasticity of demand for credit with respect to interest rates.
The condition of euphoria also permits the development of an important actor in Minsky’s
drama, the Ponzi financier (Hyman P. Minsky, 1982b, p. 123; James K. Galbraith, 1955, pp. 4-
5). These capitalists profit by trading assets on a rising market, and incur significant debt in the
process. The servicing costs for Ponzi debtors exceed the cash flows of the businesses they own,
but the capital appreciation they anticipate far exceeds the interest bill. They therefore play an

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TL;DR: In this article, 19 papers, presented at a conference held at the University of New South Wales in 1996, analyze commercial systems as evolutionary systems and acknowledge that commercial systems are evolutionary systems, and must therefore by analyzed with evolutionary tools.
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