Income for those earning the median of $26,000 a year in 1975 grew at just 30% of per capita GDP to $36,000 in 2018. Income for those earning the median of $26,000 a year in 1975 grew at just 30% of per capita GDP to $36,000 in 2018. (Photo: Shutterstock)

Just how big is the income gap? RAND Corporation attempted to gain a better understanding of changes in income inequality since the mid-1970s by creating a new metric that measures how much economic growth is shared across all income distributions.

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