akin to right hand rule of electromagnetism / cross product
lame version treats it as a thumbs-up, thumbs-down model
- let’s say, for a given idea,
- x-axis is axis of personal interest
- y-axis is axis of economic viability
- then z-axis is axis of desirability. when you curl fingers of your right hand from interest to viability, you get a thumbs-up sign. therefore, the idea is desirable. curling from viability to interest gets a thumbs-down. moral: always start from what interests you.