The modern Philips Curve model shows that pushing down unemployment results not merely in a corresponding one-time jump in inflation, but in spiraling, ever-increasing inflation, as consumers factor in the expectations of higher future prices.

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Friedman is also noted for developing the Philips Curve, an economic model that noted the inverse relationship between the rates of unemployment and inflation.

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Businesses need to build an adaptable model that can change with the times, and continuously re-evaluate their model to stay ahead of the curve.

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However, the model is still likely behind the curve.

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The BlackBerry maker continues to grow in Latin America, for example, due to the success of the Curve 8520 entry-level model, which has helped drive growth in most emerging markets.

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Because of this streamlined model, Zara is not forced to be ahead of the curve.

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The shape of the curve which describes this decline is governed by a well-known equation called the Faddy-Gosden model.

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The included app's well-designed interface shows an animation of your putts and displays a curve indicating the path of your stroke, which can be overlaid against that of a previous, model putt you've chosen.

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