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Engineering models are quantitative up to safety factors. Other models are qualitative. For weather forecasts they run multiple simulations with slightly different settings and watch them diverge before taking some average for the forecast. Similar stuff with the stochastic models of the stock market.

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All true. The Square Law of Computation still applies. And all the interactive factors affecting climate (or weather) are so numerous (and irregular) that "rounding off the corners" is inevitable. The stock market is not the same as the economy, though many people treat it as such.

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