Great Depression/Tutorials

For definitions of the terms shown in italics see the glossary on the Related Articles subpage [4].

Statistics of the US economy

Depression Data	1929	1931	1933	1937	1938	1940
Real Gross National Product (GNP) 1	101.4	84.3	68.3	103.9	103.7	113.0
Consumer Price Index 2	122.5	108.7	92.4	102.7	99.4	100.2
Index of Industrial Production 2	109	75	69	112	89	126
Money Supply M2 ($ billions)	46.6	42.7	32.2	45.7	49.3	55.2
Exports ($ billions)	5.24	2.42	1.67	3.35	3.18	4.02
Unemployment (% of civilian work force)	3.1	16.1	25.2	13.8	16.5	13.9

¹ in 1929 dollars
² 1935-39 = 100

Chart 1: GDP annual pattern and long-term trend, 1920-40, in billions of constant dollars

Causes and remedies

Contributory factors

The Gold Standard

The gold standard theory of the depression has been summarised by Bernanke and Carey , broadly as follows.

In order to curb the New York stock market boom, the Federal Reserve Bank imposed a contraction of the money supply in the late 1920s and several other major countries followed suit. That contraction was transmitted to other industrialised countries as a result of the operation of the gold standard. A rush for the safety of gold prompted by the 1931 banking crisis, the sterilisation of gold inflows by countries with balance of payments surpluses, the substitution of gold for foreign exchange reserves, and runs on many banks, all led to increases in the gold reserves required to back the issue of money and consequently to sharp and unintended reductions in the international money supply. The resulting deflation was avoidable only by a countervailing money creation by central banks but, in the absence of international agreement to do so, countries could take that action only by abandonong the gold standard.

I believe some of the crash was inevitable because of over-indebtedness, but the depression was not inevitable. The reason is that the deflation which went with the over-indebtedness was not necessary. We can always control the price level. Irving Fisher

Trade Decline and the U.S. Smoot-Hawley Tariff Act

Many economists at the time argued that the sharp decline in international trade after 1930 helped to worsen the depression, especially for countries dependent on foreign trade. Most historians and economists assign the American Smoot-Hawley Tariff Act of 1930 part of the blame for worsening the depression by reducing international trade and causing retaliation. Foreign trade was a small part of overall economic activity in the United States; it was a much larger factor in most other countries. The average rate of duties on dutiable imports for 1921-1925 was 26% but under the new tariff it jumped to 50% in 1931-1935.

In dollar terms, American exports declined from about $5.2 billion in 1929 to $1.7 billion in 1933; but prices also fell, so the physical volume of exports only fell in half. Hardest hit were farm commodities such as wheat, cotton, tobacco, and lumber. Many American farms had been heavily mortgaged as farmers bought overpriced land in the bubble of 1919-20, and defaulted.

Rival explanations

Irving Fisher

An influential economist in the early 20th century, Irving Fisher is now best known for his forecast that there would be no stock market crash - that he made immediately before it happened , (although in his defence he has pointed out that only he had predicted the inevitability of a depression, although he had seriously underestimated its severity ). Fisher's explanation of the depression was that an economy with a high level of debt had suffered a shock that had led to a loss of confidence which had prompted the widespread liquidation of debts by "distress selling", causing a sharp fall in share prices and a contraction in bank deposits; and that this had triggered a deflation which increased the stock of debt in real terms. What had followed had been a perverse cycle of further price reductions which led to further pressure to liquidate debts, which led to further price falls, and so on, which he called "debt deflation" . . Fisher maintained throughout the 1930s that a financial crash need not affect the real economy provided that there was a sufficient expansion of the money supply . The shock to which Fisher attributed the onset of the depression was the sudden reversal of the Federal Reserve Bank's monetary policy that is discussed below. .

Lionel Robbins

Lionel Robbins of the London School of Economics was at the time an influential proponent of the theories of the Austrian School of economics (although he subsequently adopted Keynesianism). His protegé, Friederich Hayek, had developed a theory of recessions, which he used in 1934 to explain the then current depression .

Rival remedies

Deficit Spending

The British economist John Maynard Keynes argued that the low aggregate demand in the economy caused a multiple decline in income, keeping the economy in an equilibrium well below full employment. In this situation, the economy may reach perfect balance, but at a cost of a high unemployment. Keynesian economists were increasingly calling for government to take up the slack by increasing government spending. Although Keynes's specific policy prescriptions at the time were vague (Perelman 1989) , his basic approach was to let business be free to do as it would choose, while creating a macroeconomic climate in which investment would be brisk or, using Keyne's own words - which became famous - creating a macroeconomic environment capable of awakening the "animal spirits" of entrepreneurs. Animal spitirts are a particular sort of confidence, "naive optimism"; "the thought of ultimate loss which often overtakes pioneers, as experience undoubtedly tells us and them, is put aside as a healthy man puts aside the expectation of death".John Maynard Keynes