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It is hard, if not impossible, to draw a firm line separating the complicated from the complex. The different domains that deal with complexity use various taxonomies for differentiation.* For our purposes, the ability to predict is the most relevant criterion, and determining exactly when things become unpredictable is tricky. All the phenomena we have discussed are at some levels predictable: We can predict the rainfall in a particular city tomorrow with relative accuracy, just not in six months. We can reliably anticipate that inflation will cause shopkeepers to raise their prices this
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