Concept
Arbitrary Coherence
2 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
Early Retirement Extreme
How this book uses it: Your current spending level is arbitrary - you adapted to it. You'll adapt to $1,000/month too.
Predictably Irrational
How this book uses it: Initial prices (anchors) are arbitrary, but once set, we're consistent with them.
