When it's normal to have no idea what your returns are
On thinking of performance in pure dollars
“Renting A Straddle”
When event pricing hides extremely cheap trading day volatility
When Car Leases Offer Options For Less Than Zero
Back out the option premium from a car lease
A birdie asked how to model a 1-day option
Thoughts about pricing 0DTEs that respect how volatility unfolds
Using Options Better
A smattering of practical option tips
Mermaids, Fireflies, and the Bid-Ask Spread
On ETF and option market-making
Life Settlement Arbitrage
A guest post showing how “markets find a way”
Know Nothing Sizing
Vol is more stable than returns
Growth rate = 70% * (doublings/years)
If you can count doublings then you can easily dazzle your friends with how fast you estimate a growth rate for any number of years.
Socratic Puzzles To Build Your Financial Intuition
Puzzles to build fundamental trading logic
What Drives The Stock Market
Fundamentals [still] matter
Index Investing: The Nature of the Proposition
What we can learn from historical performance
Inflation Replicator
Notes on my personal investing and hedging inflation
If you annualize volatility with 252 days can you use that number in a 365-day option model?
Why all implied volatilities are "wrong"
Trade or Tighten’
A common trading game for trainees
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