Perhaps the reality is that we two curves to consider.

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It is possible to calculate from the two unemployment curves approximately how many job-years of temporary employment Romer and Bernstein were forecasting would be created by their stimulus program.

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The curves for two components are relatively easy.

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But if you hit one of those beautiful winter days when the sea is calm and the sky is blue, continue along the coast path for about two miles until it curves into the hidden bay and tiny old harbour of Lamorna Cove.

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It is consistent with Gompertz's growth curves and ties together two essential features of cancer that researchers had long considered separate--cell growth and metastasis.

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