
In 1902 the city of Hanoi paid a bounty for every rat tail handed in, and before long people were spotting tailless rats in the streets, alive, well and breeding. Nobody in that story was stupid. The officials wanted fewer rats, the residents wanted the money, and the rule quietly paid for the wrong thing. Traffic jams that appear out of nowhere, bank runs that unfold in an afternoon, freeways that fill up again a few years after being widened: all of them come from the same kind of hidden wiring.
Systems thinking is the craft of seeing that wiring. Its tools are plain words rather than equations: what piles up and what drains away, which loops feed on themselves and which pull back toward balance, where the delays sit and where a small push moves a lot. Learn them and the news starts to look different. A crisis that seemed to have a single villain may turn out to have a structure behind it, and the question shifts from who to punish to what to change, without letting anyone off the hook for their own choices.
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