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Debt deflation is a theory that and depressions are due to the overall level of debt rising in real value because of deflation, causing people to default on their consumer loans and mortgages. Bank assets fall because of the defaults and because the value of their collateral falls, leading to a surge in bank insolvencies, a reduction in lending and by extension, a reduction in spending.
The theory was developed by Irving Fisher following the Wall Street crash of 1929 and the ensuing Great Depression. The debt deflation theory was familiar to John Maynard Keynes prior to Fisher's discussion of it, but he found it lacking in comparison to what would become his theory of liquidity preference.Pilkington, Philip (February 24, 2014). " Keynes' Liquidity Preference Trumps Debt Deflation in 1931 and 2008". The theory, however, has enjoyed a resurgence of interest since the 1980s, both in mainstream economics and in the heterodox school of post-Keynesian economics, and has subsequently been developed by such post-Keynesian economists as Hyman MinskyMinsky, Hyman (1992). "The Financial Instability Hypothesis". and by the neo-classical mainstream economist Ben Bernanke.Steve Keen (1995). "Finance and economic breakdown: modelling Minsky’s Financial Instability Hypothesis", Journal of Post Keynesian Economics, Vol. 17, No. 4, 607–635
He further rejected the notion that over-confidence alone, rather than the resulting debt, was a significant factor in the Depression:
In the context of this quote and the development of his theory and the central role it places on debt, it is of note that Fisher was personally ruined due to his having assumed debt due to his over-confidence prior to the crash, by buying stocks on margin.
Other debt deflation theories do not assume that debts must be paid, noting the role that default, bankruptcy, and foreclosure play in modern economies.
The following decades saw occasional mention of deflationary spirals due to debt in the mainstream, notably in The Great Crash, 1929 of John Kenneth Galbraith in 1954, and the credit cycle has occasionally been cited as a leading cause of economic cycles in the post-WWII era, as in , but private debt remained absent from mainstream macroeconomic models.
James Tobin cited Fisher as instrumental in his theory of economic instability.
Debt-deflation theory has been studied since the 1930s but was largely ignored by neoclassical economists, and has only recently begun to gain popular interest, although it remains somewhat at the fringe in U.S. media.Fisher, I. (1933) "The Debt-Deflation Theory of Great Depressions," Econometrica 1 (4): 337-57Grant, J. (2007) "Learn From the Fall of Rome, U.S. Warned," Financial Times (14 August)Robert Peston, "UK's debts 'biggest in the world'," BBC (21 November 2011).
Building on both the monetary hypothesis of Milton Friedman and Anna Schwartz as well as the debt deflation hypothesis of Irving Fisher, Bernanke developed an alternative way in which the financial crisis affected output. He builds on Fisher's argument that dramatic declines in the price level and nominal incomes lead to increasing real debt burdens, which in turn leads to debtor insolvency, thus leading to lowered aggregate demand and further decline in the price level, which develops into a debt deflation spiral. According to Bernanke a small decline in the price level simply reallocates wealth from debtors to creditors without doing damage to the economy. But when the deflation is severe, falling asset prices along with debtor bankruptcies lead to a decline in the nominal value of assets on bank balance sheets. Banks will react by tightening their credit conditions. That in turn leads to a credit crunch that does serious harm to the economy. A credit crunch lowers investment and consumption, which leads to declining aggregate demand, which additionally contributes to the deflationary spiral.Randall E. Parker, Reflections on the Great Depression, Edward Elgar Publishing, 2003, , p. 14-15
The financial instability hypothesis of Hyman Minsky, developed in the 1980s, complements Fisher's theory in providing an explanation of how credit bubbles form: the financial instability hypothesis explains how bubbles form, while debt deflation explains how they burst and the resulting economic effects. Mathematical models of debt deflation have recently been developed by post-Keynesian economist Steve Keen.
Later commentators do not in general believe that reflation is sufficient, and primarily propose two solutions: debt relief – particularly via inflation – and fiscal stimulus.
Following Hyman Minsky, some argue that the debts assumed at the height of the bubble simply cannot be repaid – that they are based on the assumption of rising asset prices, rather than stable asset prices: the so-called "Ponzi units". Such debts cannot be repaid in a stable price environment, much less a deflationary environment, and instead must either be defaulted on, forgiven, or restructured.
Widespread debt relief either requires government action or individual negotiations between every debtor and creditor, and is thus politically contentious or requires much labor. A categorical method of debt relief is inflation, which reduces the real debt burden, as debts are generally nominally denominated: if wages and prices double, but debts remain the same, the debt level drops in half. The effect of inflation is more pronounced the higher the debt to GDP ratio is: at a 50% ratio, one year of 10% inflation reduces the ratio by approximately to 45%, while at a 300% ratio, one year of 10% inflation reduces the ratio by approximately to 270%. In terms of Exchange rate, particularly of sovereign debt, inflation corresponds to currency devaluation. Inflation results in a wealth transfer from creditors to debtors, since creditors are not repaid as much in real terms as was expected, and on this basis this solution is criticized and politically contentious.
In the Keynesian tradition, some suggest that the fall in aggregate demand caused by falling private debt can be compensated for, at least temporarily, by growth in public debt – "swap private debt for government debt", or more evocatively, a government credit bubble replacing the private credit bubble. Indeed, some argue that this is the mechanism by which Keynesian economics actually works in a depression – "fiscal stimulus" simply meaning growth in government debt, hence boosting aggregate demand. Given the level of government debt growth required, some proponents of debt deflation such as Steve Keen are pessimistic about these Keynesian suggestions. Can the USA debt-spend its way out?, November 29th, 2008, Steve Keen
Given the perceived political difficulties in debt relief and the suggested inefficacy of alternative courses of action, proponents of debt deflation are either pessimistic about solutions, expecting extended, possibly decades-long depressions, or believe that private debt relief (and related public debt relief – de facto sovereign debt repudiation) will result from an extended period of inflation.
There was a renewal of interest in debt deflation in academia in the 1980s and 1990s, and a further renewal of interest in debt deflation due to the 2008 financial crisis and the ensuing Great Recession.
In 2008, Deepak Lal wrote, "Bernanke has made sure that the second leg of a Fisherian debt deflation will not occur. But, past and present U.S. authorities have failed to adequately restore the balance sheets of over-leveraged banks, firms, and households."Deepak Lal, "The Great Crash of 2008: Causes and Consequences," Cato Journal, 30(2) (2010), p.271-72. After the 2008 financial crisis, Janet Yellen in her speech acknowledged Minsky's contribution to understanding how credit bubbles emerge, burst and lead to deflationary asset sales. She described how a process of balance sheet deleveraging ensued while consumers cut back on their spending to be able to service their debt. Similarly invoking Minsky, in 2011 Charles J. Whalen wrote, "the global economy has recently experienced a classic Minsky crisis – one with intertwined cyclical and institutional (structural) dimensions."Charles J. Whalen, "Rethinking Economics for a New Era of Financial Regulation: The Political Economy of Hyman Minsky," Chapman Law Review, 15(1) (2011), p. 163.
Kenneth Rogoff and Carmen Reinhart's works published since 2009 have addressed the causes of financial collapses both in recent modern times and throughout history, with a particular focus on the idea of .
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