Thinking in Systems
The most accessible introduction to systems thinking: feedback loops, stocks and flows, delays, nonlinear dynamics, and emergent behavior. Markets ARE complex adaptive systems, and seeing them that way is a paradigm shift most professional investors never achieve. Meadows' insight that rational individual actions can produce collectively irrational outcomes explains half of what's puzzling about financial markets.
Meadows died before finishing it, and the seams show: the manuscript dates from 1993, so the examples (fisheries, the Cold War arms race) arrive from a time capsule. Worse, it teaches you to see feedback loops everywhere without teaching you to model a single one. You finish convinced of complexity and exactly as unequipped as you started.
The case for it and the rest of the canon open with Pro.
