Trends in arithmetical average incomes and median household incomes have differed in the us for a variety of reasons.

在美国，数学计算的平均收入趋势和家庭收入中位数的趋势截然不同，原因是多种多样的。

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But in fact, the main reason for the two indices rising at different rates is because they use different arithmetical methods for calculating average prices.

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Most people can be above average when we use average to mean the arithmetical mean.

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