Industrial consolidation  The following figure, from Investor’s Business Daily,

Industrial consolidation  The following figure, from Investor’s Business Daily, shows how quickly the U.S. metal processing industry is consolidating. The linear equation that is the best fit for the number of metal processors as a function of years after 1990 is y1 = -329.6970x + 5392.1212, and the best exponential fit is y2 = 9933.7353e-0.1672x. The linear equation gives a much better fit for the data points than the exponential equation. Why, then, is the exponential equation a more useful model to predict the number of metal processors in 2015?

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