Considering how education significantly enhances the earnings potential of individuals, it should come as no surprise that individuals with graduate degrees have an average per capita income exceeding the median household income of married couple families among the general population ($63,813). Higher educational attainment did not, however, help close the income gap between the genders as the life-time earnings for a male with a professionals degree were roughly forty percent (39.59%) higher than those of a female with a professionals degree. The life-time earnings gap between males and females was the smallest for those individuals holding an Associate degrees with male life-time earnings being 27.77% higher than those of females. While educational attainment did not help reduce the income inequality between men and women, it did increase the earnings potential of individuals of both sexes, greatly enabling many households with (a) graduate degree householder(s) to enter the top household income quintile.
Household income also increased significantly with the educational attainment of the householder. The US Census Bureau publishes educational attainment and income data for all households with a householder who was aged twenty-five or older. The biggest income difference was between those with some college education and those who had a Bachelor's degree, with the latter making $23,874 more. Income also increased substantially with increased post-secondary education. While the median household income for a household with a household holding an associate degree was $51,970, the median household income for those with a bachelor's degree or higher was $73,446. Those with doctorates had the second highest median household with a median of $96,830; $18,289 more higher than that for those at the Master's degree level, but $3,170 lower than the median for households with a professionals degree holding householder.
SOURCE: US Census Bureau, 2003
The change in median personal and household since 1991 also varied greatly with educational attainment. While, both the overall median personal and household icome increased since 1991, this increase did not take place on all levels of educational attainment. The overall income increased over the course of the 1990s, reaching its high in 1999, but decreasing has been ever since. In 1991 the median household income in the US was $40,873 in 2003 dollars, while the median household income in 2003 was $45,016. In 1999, however, the median household income was $46,236, 2.7% higher than today. While this trend held true for all levels of educational attainment the extend of chorinical falcutations in income were greatly influenced by educational attainment. Overall the median household and personal income decreased for those with more than a 9th grade education but less than a four-year college degree since 1991. In other words, the median household income decreased for households and individuals at the high school drop-outs and graduate, some-college, and an Associates degree level. Income did, however, increase for those with a Bachelor's degree or more. The following table shows the median household income according to the educational attainment of the householder. All data is in 2003 dollars and only applies to householders whose householder is aged twenty-five or older. The highest and lowest points of the median household income are presented in bold face.
SOURCE: US Census Bureau, 2003
Household income in the United States varies substantially with the age of the person who heads the household. Overall the median household income increased with the age of householder until retirement age when household income started to decline. The highest median household income was found among households headed by working baby-boomers. Households headed by persons between the ages of 45 and 54 had a median household income of $61,111 and a mean household income of $77,634. The median income per member of household for this particular group was $27,924. The highest median income per member of household was among those between the ages of 54 and 64 with $30,544. The group with the second highest median household income, were households headed by persons between the ages 35 and 44 with a median income of $56,785, followed by those in the age group between 55 and 64 with $50,400. Not surprisingly the lowest income group was mainly comprised of those households headed by individuals younger than 24, followed by those headed by persons over the age of 75. Overall households headed by persons above the age of seventy-five had a median household income of $20,467 with the median household income per member of household being $18,645. These figures support the general assumption that median household income as well as the median income per member of household peaked among those households headed by middle aged persons, increasing with the age of the householder and the size of the household until the householder reaches the age of 64. With retirement income replacing salaries and the size of the household declining, the median household income decreases as well.
Please note that all figures are presented in 2003 dollars.
Since 1967, the median household income in the United States has risen modestly, fluctuating several times. Even though personal income has risen substantially and 42% of all household now have two income earners, the median household income has increased only slightly. According to the US Census Bureau, this paradoxical set of trends is due to the changing structure of American households. For example, while the proportion of wives working year-round in married couple households with children has increased from 17% in 1967 to 39% in 1996, the proportion of such households among the general population has decreased. Thus, while married couple households with children are the most economically prosperous type of household in the United States, their share of the population has been dwindling in the United States. In 1969, more than 40% of all households consisted of a married couple with children. By 1996 only a rough quarter of US households consisted of married couples with children. As a result of these changing household demographics, median household income rose only slighly despite an ever increasing female labor force and a considerable increase in the percentage of college graduates.
Overall, the median household income rose from $33,338 in 1967 to an all-time high of $44,922 in 1999, and has since decreased slightly to $43,318. Decreases in household income are visible during each recession, while increases are visible during economic upturns. These fluctuations were felt across the income strata as the incomes of both, the 95th and 20th percentile were affected by fluctuations in the economy. Yet, it is important to note that income in the period between 1967 and 1999 grew faster among wealthier households than it did among poorer households. For example, the household income for the 80th percentile, the lower threshold for the top quintile, rose from $55,265 in 1967 to $86,867 in 2003, a 57.2% increase. The median household income rose by 30% while the income for the 20th percentile (the lower threshold for the second lowest quitile) rose by only 28% from $14,002 to $17,984. One should note that the majority of households in the top quintile had two income earners, versus zero for the lowest quintile and that the widening gap between the top and lowest quintile may largely be the reflection of changing household demographics including the addition of women to the workforce.