The Missing Square
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About this resource
A free 8-page kit on the +50% / −40% coin: a bet that wins 5% a flip on average, yet leaves 86% of players behind after 100 flips. One picture shows why: volatility cuts a square out of your money, and the same square is the −½σ² in Itô's lemma and in Black–Scholes' d2 and sets the Kelly bet (25% here). Exact binomial numbers, twelve interview follow-ups with answers, a cheat sheet and a 60-second answer. The download is a zip with the PDF and a runnable notebook for Colab or Jupyter: 10,000 simulated players, Itô's correction measured on simulated paths, leveraged-ETF drag and the Kelly curve.
What you get
- Instant digital delivery by email after purchase
- Written by a practising quantitative risk modeller
- Desk-focused material, not textbook theory
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Frequently asked questions
How is The Missing Square delivered?
Access is delivered digitally by email after payment is verified. Keep the purchase email so you can find the delivery link later.
Who is The Missing Square designed for?
It is designed for quantitative-finance candidates and practitioners who want desk-focused explanations, practical diagnostics and interview-ready reasoning.
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