Money Math

Using Geometry to See Why Volatility Scales With √t

I had Claude make me a custom chalkboard app for making math and investing tutorials Khan Academy-style. For fun, I…

1 week ago

Iron Condor Destroyer

Workflows are Moontower’s screeners organized around what you’re trying to do: sell premium (Income), buy protection (Defensive), finance that protection…

4 weeks ago

vibey vs discrete trades

At the Robinhood Summit last week, Mat Cashman and I hosted a “Trading Lab” emphasizing that options are surgical tools.…

1 month ago

Taylor Expansion — Cheatsheet

Stand at one spot on a curve, measure everything you can there, and use those measurements to guess the height…

1 month ago

Kelly Criterion — Cheatsheet Derivation

Kelly Criterion — Cheatsheet Derivation Step 1 One Period Expectancy E = pB − q where p = win probability,…

2 months ago

“end behavior”

Alex is an options trader you should follow in case he ever tweets a lot. Because he doesn’t, when he…

2 months ago

Variance & Covariance Cheat Sheet

Variance & Covariance Cheat Sheet Starting points (where every derivation begins) Everything below is derived from these definitions. They're the…

2 months ago

after this post you will be sizing bets in your head

One of the most important concepts in risk-taking is bet sizing. Which is unfortunate because people are quite bad at…

2 months ago

stock-bond correlation

Return Stacked’s RSSB gives you a dollar of global equities and a dollar of Treasuries on the same dollar of…

3 months ago

collar shopping

At the end of July, Dean Curnutt tweeted: The thread should sound familiar. Weeks earlier, Dean tweeted about SNDK vols presenting…

3 months ago