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Personal finance, investing, and financial literacy.

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How to finance with VisiMark: NPV, IRR, PMT

How to finance with VisiMark: NPV, IRR, PMT

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5 min read
The Crash That Never Happened: Cleaning Price Data Before You Trust It

The Crash That Never Happened: Cleaning Price Data Before You Trust It

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5 min read
Simulating Last Look: The Broker's Hold Window in 50 Lines of Python

Simulating Last Look: The Broker's Hold Window in 50 Lines of Python

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3 min read
I pre-registered a test of a famous market effect — here's how it failed

I pre-registered a test of a famous market effect — here's how it failed

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7 min read
The $518 Billion Compute Swap: Inside Anthropic's IPO Prospectus

The $518 Billion Compute Swap: Inside Anthropic's IPO Prospectus

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4 min read
The Price of Thought: Does Test-Time Reasoning Pay in LLM Trading?

The Price of Thought: Does Test-Time Reasoning Pay in LLM Trading?

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3 min read
How to Stop AI From Hardcoding Values in a Financial Model

How to Stop AI From Hardcoding Values in a Financial Model

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9 min read
We Had Four Records for One Supplier and Paid Its Invoice Twice

We Had Four Records for One Supplier and Paid Its Invoice Twice

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2 min read
Debugging a Compound Interest Calculation: A Coder's Field Guide to Finding the Off-by-One-Period Bug

Debugging a Compound Interest Calculation: A Coder's Field Guide to Finding the Off-by-One-Period Bug

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7 min read
The AI Diversification Illusion

The AI Diversification Illusion

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3 min read
Build an insider-buying screener with Python and SEC Form 4 data

Build an insider-buying screener with Python and SEC Form 4 data

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8 min read
Annual billing looks cheaper. Here is the month it actually becomes cheaper.

Annual billing looks cheaper. Here is the month it actually becomes cheaper.

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2 min read
How AI Hyperscaler Debt Is Repricing Its Own Hurdle Rate

How AI Hyperscaler Debt Is Repricing Its Own Hurdle Rate

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4 min read
How to Get Reliable Options Chain Data in Python (When yfinance Keeps Failing)

How to Get Reliable Options Chain Data in Python (When yfinance Keeps Failing)

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8 min read
Build a Polymarket research brief with Python and AlphAI

Build a Polymarket research brief with Python and AlphAI

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7 min read
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