Depressions and theories of the cycle

Detail

1. What a depression is

• Business cycle: the repeated rise and fall of economic activity around its long-run trend. It has four phases: boom, recession, trough and recovery.
• Recession: a fall in output and jobs that lasts a while. A common rule of thumb is two quarters in a row of falling real GDP.
• Depression: a severe, long downturn, deeper and longer than a recession.
• Output, employment, prices and investment all fall sharply.

• It is the extreme end of the business cycle.

• Deflation: a fall in the general price level. In a depression prices fall, not just output. This makes the slump worse (see debt deflation below).

2. The Great Depression (1929 onward; worst in 1929-33)

• Scale in the USA (Class 12, Introduction):
• Unemployment rose from 3% to 25% (1929-33).
• Factories lay idle because demand was low.

• Europe, North America and the wider world were all hit.

• Output fall:

• Real GDP (output at constant prices) fell by roughly a quarter (1929-33). (NCERT: US aggregate output fell "by about 33 per cent". That larger figure is closer to the fall in nominal output, which is output at current prices.)
• Britannica puts the GDP fall at about 30% and the fall in industrial production at nearly 47% (1929-33) [2]. Estimates differ because they use different price measures.

• Britannica says unemployment went "above 20%" (1929-33) [2]. This fits NCERT's 25% peak.

• Why real and nominal differ (worked example):

• Nominal GDP = real output × price level.
• Say real output falls 25% (to 0.75) and prices fall 10% (to 0.90).
• Nominal GDP = 0.75 × 0.90 = 0.675, which is a fall of about 32.5%.
• So a "33%" fall mixes the output fall with the price fall.

3. Causes of the Great Depression

• Wall Street crash (October 1929):
• Share prices collapsed. People lost wealth and confidence.

• Spending and investment were cut sharply [3].

• Bank failures (about 9,000 in 1930-33):

• Bank run: many depositors rush to withdraw their money at once, fearing the bank will fail.
• Panics followed one another. By 1933, 20% of the banks that existed in 1930 had failed [2].

• When a bank fails, the money it could have lent disappears. Firms cannot borrow [3].

• Monetary contraction:

• The money stock (total money held by the public, including bank deposits) fell by about a third.

• Friedman and Schwartz, A Monetary History of the United States (1963): they blamed the Federal Reserve (the US central bank) for not pumping in money to save banks. So an ordinary recession turned into a depression.

• Gold standard:

• Gold standard: each currency is fixed to a set amount of gold, so exchange rates are fixed.
• Countries losing gold had to raise interest rates to protect it. Loans became costlier, so spending fell [3].

• In this way deflation spread from country to country.

• Smoot-Hawley Tariff Act (1930):

• The USA put steep tariffs (import taxes) on many industrial and farm goods.

• Other countries retaliated (hit back with their own tariffs). World trade shrank [3].

• Fisher's debt deflation (1933):

• Debt deflation: when prices fall, the real burden of a fixed debt rises.
• The chain: prices fall → debts are harder to repay → borrowers sell goods and assets in a hurry (distress sales) → prices fall further.
• Worked example: a farmer owes ₹1,000 and wheat sells at ₹10 a kg, so the debt equals 100 kg of wheat. If wheat falls to ₹5 a kg, the same debt now equals 200 kg. The debt has doubled in real terms.

4. Response to the Great Depression

• Roosevelt's New Deal (from 1933): US government spending on public works, relief and job schemes, plus banking reforms.
• Keynes, The General Theory of Employment, Interest and Money (1936):
• Unemployment can last a long time because aggregate demand (total planned spending in the economy, AD = C + I + G + (X − M)) is too low. This is called deficient demand.
• Markets do not correct this on their own. So the government should spend more.

• This was the birth of macroeconomics (Class 12, Introduction).

• Deficient demand (Class 12, Chapter 4):

• Planned spending is below the output the economy makes at full employment.
• This creates a deflationary gap, meaning output falls and jobs are lost.

5. India in the 1930s

• Farm prices collapsed, roughly halving (1929-31).
• Indian peasants were in debt and could not repay their loans. They sold their gold and silver.
• This led to large "distress gold" exports:
• They helped Britain, which used the gold to settle its payments.
• They drained wealth from rural India.

6. Why cycles happen: the main theories

Theory	Main driver	Policy lesson
Keynesian	Swings in aggregate demand. The multiplier-accelerator (Samuelson): investment raises income, and rising income raises investment	Use government spending and tax (fiscal policy) against the cycle
Monetarist (Friedman)	Monetary shocks and central bank mistakes	Let money supply grow at a steady rate (a fixed rule)
Real business cycle (Kydland-Prescott)	Technology and supply shocks. Cycles are efficient responses to them	Little role for government action
Austrian (Hayek, Mises)	Cheap credit creates an unsustainable boom, then a bust	Avoid keeping interest rates artificially low
Minsky	Stability breeds risk-taking: hedge → speculative → Ponzi finance, then a "Minsky moment"	Regulate finance, and have the central bank act as lender of last resort

• Multiplier (k):
• Formula: k = 1 / (1 − MPC) = 1 / MPS. MPC (marginal propensity to consume) is the share of each extra rupee that people spend.

• Worked example: if MPC = 0.8, then k = 1/0.2 = 5. An extra ₹100 crore of investment raises income by ₹500 crore.

• Accelerator:

• Investment depends on the change in income: I = v × ΔY. Here v is the capital-output ratio.

• Worked example: if v = 2 and income rises by ₹50 crore, investment is ₹100 crore.

• Multiplier-accelerator link:

• Investment raises income through the multiplier.
• Rising income raises investment through the accelerator.

• When income growth slows, investment falls. This creates turning points, so the economy moves in waves.

• Real business cycle (Kydland and Prescott; Nobel 2004):

• A bad harvest or an oil shock lowers productivity. Firms and workers then choose to produce less.

• In this view, the fall is the best response to the shock, not a market failure.

• Austrian theory:

• The central bank keeps interest rates below their "natural" level.
• Firms start too many long projects.

• Savings are not enough to finish them, so the projects fail. The result is a bust.

• Minsky's financial instability hypothesis:

• Hedge finance: income repays both interest and principal. This is safe.
• Speculative finance: income covers only interest. The loan must be rolled over (renewed).
• Ponzi finance: income cannot even cover interest. The borrower depends on asset prices rising.
• Minsky moment: the point where asset prices stop rising and forced selling begins. The 2008 crisis is the classic example.

7. Cycle lengths

Cycle	Length	Driver
Kitchin	3-4 years	Inventories (stocks of goods firms hold)
Juglar	7-11 years	Fixed investment (machinery, plant)
Kuznets swings	15-25 years	Construction and demographics
Kondratiev waves	about 40-60 years	Clusters of innovation

• Schumpeter, Business Cycles (1939): linked Kondratiev waves to clusters of innovation (steam, railways, electricity, IT).
• Creative destruction (Schumpeter): new technologies destroy old industries while creating new ones.

8. Secular stagnation

• Secular stagnation: a long period of low growth, low interest rates and weak demand.
• "Secular" here means long-term, not tied to one cycle.

• Desired saving is higher than investment even when interest rates are near zero.

• Hansen (1938) coined the idea. He gave three reasons [4]:

• the end of the frontier (no new land to settle);
• the end of rapid population growth;

• the end of capital-heavy technical change.

• Summers (November 2013) revived it.

• He argued that a chronic shortage of aggregate demand was keeping growth and inflation low [4].

• People wanted to save more and to spend and invest less. This held down equilibrium interest rates [4].

• Example: Japan's "lost decades" after 1990. Asset prices crashed, prices were flat or falling, and growth was weak for years.

• r* (neutral or natural real interest rate): the real interest rate at which the economy runs at full capacity with stable inflation. At r*, policy neither speeds the economy up nor slows it down.
• Real rate ≈ nominal rate − expected inflation.
• Worked example: repo rate 5.5% − expected inflation 4% = real rate of 1.5%.

• Zero lower bound: nominal rates cannot go much below 0%. So if r* is very low, the central bank cannot cut rates enough to revive demand. This is why low r* is linked to secular stagnation.

• India's r* (RBI estimates):

• 1.4-1.9% for Q4:2023-24, up from 0.8-1.0% for Q3:2021-22 [5][6].
• The RBI says these estimates carry wide bands of uncertainty [5].

9. Post-COVID recession and recovery in India

• 2020-21: real GDP contracted 5.8%. This was India's first full-year contraction in over four decades [7].
• 2021-22: real GDP grew 9.1% [7]. This is often called a "V-shaped" recovery: a sharp fall followed by a sharp rebound.
• How it differs from the 1930s:
• The cause was a supply shock (lockdowns), not a banking collapse.
• Fiscal and monetary support came quickly, as Keynes and Friedman would have advised.

Prelims Hooks

• Great Depression (1929-33): US unemployment went from 3% to 25%, and real GDP fell about a quarter. NCERT's "33%" is closer to the fall in nominal output.
• About 9,000 US banks failed (1930-33). By 1933, 20% of the banks of 1930 had closed [2].
• Smoot-Hawley Tariff Act (1930) was a US tariff law. It triggered retaliation and shrank world trade [3].
• Friedman and Schwartz (1963) blamed the Federal Reserve for the Depression through monetary contraction. Fisher (1933) gave debt deflation.
• Keynes's General Theory (1936) marks the birth of macroeconomics. It explains unemployment through deficient aggregate demand.
• Multiplier = 1/(1 − MPC). The multiplier-accelerator model is Samuelson's.
• Match: Kitchin → inventories (3-4 yrs); Juglar → fixed investment (7-11 yrs); Kuznets → construction (15-25 yrs); Kondratiev → innovation (40-60 yrs).
• Real business cycle theory is Kydland-Prescott's. It treats cycles as efficient responses to supply shocks. Trap: it is not Keynesian.
• Secular stagnation: coined by Hansen (1938) and revived by Summers (2013). It is linked to a low r*.
• Minsky's order: hedge → speculative → Ponzi finance.

Mains Points

• Rules versus discretion: the Depression and COVID show two kinds of shocks.
• With demand collapses, the Keynesian lesson is that the government should spend more.
• With banking panics, the monetarist lesson is that the central bank must lend freely.

• India in 2020-21 used both: RBI liquidity support and a fiscal package. It achieved a rebound from −5.8% to 9.1% [7].

• Protectionism spreads recessions:

• Smoot-Hawley and the fixed gold standard sent the US slump abroad [3].

• This is relevant to today's tariff wars and to the case for WTO rules and flexible exchange rates.

• Financial fragility (Minsky/Austrian view):

• Long periods of cheap credit build up hidden risk.

• This supports macroprudential regulation, such as RBI limits on lending and bank capital buffers. Recall India's twin balance sheet problem after the 2000s credit boom.

• Secular stagnation and r*:

• Ageing economies with low r* have little room to cut rates.
• India's younger population and higher r* (1.4-1.9%, 2023-24) give it more room for monetary policy [5]. But it must turn this demographic dividend into investment.