product-psychology
The Best Books on Product Psychology
The books that explain why users behave the way they do — not process, not frameworks. Kahneman, Ariely, Cialdini, Norman, and the rest, with a quote and an honest drawback for each.
product-management
pricing
Charm Pricing: Why the Last Digit Is Positioning, Not Math
Everyone knows the $9.99 trick. Everyone still falls for it. Here's why the last digit of your price is a positioning decision, not a math one.
jobs-to-be-done
Jobs To Be Done: Why Nobody Actually Wants Your Product
A fast-food chain couldn't sell more milkshakes—until they stopped studying the milkshake and started watching who bought it, and when. That's Jobs to Be Done.
goodharts-law
Goodhart's Law: Why the Metric You Target Stops Working
Set a target, and your team will hit it — often without touching the thing you actually care about. Goodhart's Law explains why every metric you optimize eventually lies to you.