It is important to analyze the tail behavior of distributions in many areas, and there is a controversy about distinctions between exponential-type and power-type tails.

分布的尾部特征分析在许多领域都非常重要，估计和分辨尾部服从幂律特征还是指数特征非常重要。

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And what he found was that the mere fact that people get closer to each other stimulates all sorts of productive behavior, behavior which produces tangible results that grow at an exponential rate.

FORBES: One Man's Slum Is Another Man's Manhattan