← Book library

Risk & ruin

The (Mis)behavior of Markets

Benoit Mandelbrot

Markets have fat tails - the 'once in a lifetime' crash arrives far more often than the bell curve promises, so plan for wildness.

Start reading →

Chapters

13
  1. Chapter 01Risk, Ruin, and RewardMarkets are far wilder than the neat bell-curve math claims, so the real danger is being wiped out, not just a bad year.Read this chapter →
  2. Chapter 02By the Toss of a Coin or the Flight of an Arrow?There are two kinds of randomness - mild like a coin toss and wild like a stray arrow - and markets run on the wild kind.Read this chapter →
  3. Chapter 03Bachelier and His LegacyModern finance is built on a 1900 idea that prices wander like a coin toss - elegant, influential, and wrong.Read this chapter →
  4. Chapter 04The House of Modern FinancePortfolio theory, CAPM and Black-Scholes all rest on the same shaky bell-curve foundation.Read this chapter →
  5. Chapter 05The Case Against the Modern Theory of FinanceEvidence against the standard models has piled up for decades, yet the profession keeps using them because the math is easy.Read this chapter →
  6. Chapter 06Turbulent Markets: A PreviewMarkets behave like turbulent weather - violent bursts that cluster together, not a smooth steady drift.Read this chapter →
  7. Chapter 07Studies in Roughness: A Fractal PrimerA price chart is rough and self-similar - zoom in on a day and it looks like a year, so no scale is 'smooth' enough for risk to vanish.Read this chapter →
  8. Chapter 08The Mystery of CottonCotton prices obeyed a fat-tailed power law that held across every timescale - hard proof markets aren't bell-curved.Read this chapter →
  9. Chapter 09Long Memory, from the Nile to the MarketplaceLike Nile floods, markets have long memory - trends and dependence stretch far longer than pure chance would allow.Read this chapter →
  10. Chapter 10Noah, Joseph, and Market BubblesTwo forces - sudden jumps and long trends - combine to make bubbles inflate and then burst without warning.Read this chapter →
  11. Chapter 11The Multifractal Nature of Trading TimeMarkets run on their own elastic clock that races during turmoil and crawls in calm, so a month's risk can hit in a single day.Read this chapter →
  12. Chapter 12Ten Heresies of FinanceTen blunt lessons: markets are turbulent, far riskier than the textbooks say, and you should forecast volatility rather than price.Read this chapter →
  13. Chapter 13In the LabFractal finance is unfinished work - a better map of risk, not a crystal ball that tells you what to buy.Read this chapter →

This is my own plain-English understanding of the book’s ideas, in my own words with my own ₹ examples, laid out against the book’s real chapters so you can relate the two. It is not the book and reproduces none of its text - if it helps, please buy the book. Not affiliated with the author or publisher. The author is not SEBI-registered; nothing here is investment advice.