Here's a comparison of income by household size stretching from the 1980 Census to the 2013 Three Year ACS Estimates. The income levels have all been adjusted to 2013 dollars to account for inflation. The only two household sizes showing any true statistical change in income level over that period of time are the 2 person and 4 person households. This is based on the margins of error from he 2013 ACS data.
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