altys.ai

A Field Guide

Investing Mental Models

The habits of thought that separate a screen from a decision.

2 of 10 chapters published · 8 more to come

  1. Chapter 1 Investing Then vs Now: What AI Actually Changed AI did not remove the need to understand a business. It changed the unit of research from one company at a time to one sourced question across the market.
  2. Chapter 2 P/E Below 20 Worked for Me. Until It Didn’t. Five FY26 IT companies all traded below 20 times earnings, yet their growth, returns on capital and cash conversion were very different. The threshold was only the first question.
  3. Chapter 3 Is PE Really the Best Indicator? The price-to-earnings ratio is a useful shorthand, not the best indicator, and often not a valuation measure at all. Here is what professionals read alongside it, and why. Coming soon

More chapters are being written and will appear here as they publish.