New on FinoLib · Volume III: Finance Encyclopedia
I have just published a new article on FinoLib, my free finance education library: Keynesian Economics Explained: Keynes and the Revolution. It is part of Volume III: Finance Encyclopedia. Below is a summary of the topic in plain, expert language, so you can follow the idea even before you open the full article.
The idea in plain words
In 1936, Keynes argued that an economy can stay stuck in mass unemployment, and that when private demand is weak, government deficit spending can lift demand through the multiplier: each dollar spent becomes income for someone who spends part of it again. Fisher added debt deflation, and Minsky showed how borrowing drifts, in good times, from safe hedge finance to speculative and then Ponzi borrowing, making busts deeper.
Key points
■With 75% of extra income spent the textbook multiplier is 4; taxes and imports cut it to 2, and modern estimates mostly lie between 0.6 and 1.
■Fisher (1933): debts fell 20% in dollars by 1933 while the dollar gained 75%, so real debt rose to 1.40 times.
■Minsky classifies borrowers as hedge, speculative or Ponzi; a loan at 3% can cross into Ponzi territory if rates rise above 7%.
■Kindleberger read four centuries of crises through the Minsky model and stressed the lender of last resort.
A closer look
John Maynard Keynes, writing during the Great Depression in The General Theory of Employment, Interest and Money (1936), challenged the classical assumption that free markets would quickly self-correct back to full employment after a downturn. The argument. During a severe demand shortfall an economy can stay stuck with high unemployment and idle capacity, because falling wages and prices cut incomes and spending as fast as they cut costs, so they do not restore full employment quickly enough. Active government intervention, above all deficit-financed fiscal spending (Part 3.4 covers the budget mechanics), can and should be used to boost demand and pull an economy out of a depression faster than waiting for the market to correct itself.
A worked example
Worked Example — Compare the Scenarios: Minsky’s Three Borrowers
A developer borrows $10 million against a property producing $700,000 a year of cash flow after costs. The lender expects $250,000 a year of principal repayment on top of interest. Minsky’s test asks whether cash flow covers interest and principal (hedge), interest only (speculative: principal must be refinanced), or not even interest (Ponzi: the debt grows unless the asset can be sold at a higher price). Interest rate Interest Interest + principal Cash flow ÷ debt service Minsky class 3.0% $300,000 $550,000 700 ÷ 550 = 1.27 Hedge 5.0% $500,000 $750,000 700 ÷ 750 = 0.93 Speculative 7.5% $750,000 $1,000,000 700 ÷ 1,000 = 0.70 (interest alone 0.93) Ponzi: $50,000 a year short The flip points.
Decision rule
Apply Minsky’s test to any leveraged borrower or portfolio. Compute cash flow ÷ (interest + scheduled principal) at today’s rate and at today’s rate plus 2 percentage points. If the ratio stays at 1.0 or above in both, the borrower is hedge-financed. If it covers interest but not principal under the stress, treat the loan as dependent on refinancing and price it that way. If stressed cash flow does not cover interest, the loan depends on the asset rising in value; size it as an equity bet.
The costliest mistake
Underwriting at today’s rate when the loan must be refinanced. In the worked example, a $10 million loan sized at 3% shows cash flow covering debt service 1.27 times and looks safe. Refinanced at 7.5%, interest alone is $750,000 against $700,000 of cash flow, a $50,000 annual shortfall before any principal, and the flip to Ponzi happens at 7.0%. Fisher’s arithmetic shows how the loss compounds when prices fall at the same time: cut the debt by 20% while the currency gains 75% in purchasing power and the real burden rises to 1.40 times.
Why It Matters
Keynes’s work is the direct intellectual origin of modern countercyclical fiscal policy, the deliberate use of government spending and automatic stabilizers (Part 3.4) to smooth the business cycle, and remains one of the two great poles, alongside monetarism (Part 9.6: Friedman, Monetarism, and the Chicago School), around which modern macroeconomic policy debate continues to orbit. Fisher and Minsky added the financial half: the same leverage that powers a boom decides how deep the bust is.
Recap
Keynes argued that demand shortfalls can trap an economy and that the multiplier lets deficit spending lift income, though modern estimates of spending multipliers are mostly 0.6 to 1. Fisher’s debt deflation and Minsky’s hedge, speculative and Ponzi borrowers explain how leverage built in good times turns a downturn into a crisis.
What the full article covers
The full article includes worked examples, a look under the hood at the mechanics, a clear decision rule, the one mistake that costs people the most, a recap, a reveal-on-click quiz and the official sources behind every figure.
Volume III: Finance Encyclopedia
Read the full article on FinoLib
The complete article, Keynesian Economics Explained: Keynes and the Revolution, with every worked example, diagram, quiz and source, is free to read in Volume III, Finance Encyclopedia on finolib.com.
Explore the Finance Education Series: Vol. II — Capital Markets · Vol. I — Global Economy · Vol. III — Finance Encyclopedia · Vol. IV — Finance Careers · Vol. V — Personal Finance