There are approximately 100 million households—a group of people sharing living quarters—in the United States. The number of residents per household has consistently shrunk during this century, from over four to under three, as illustrated in Figure 4.14 "Household occupancy".
Figure 4.14 Household occupancy
Figure 4.15 Proportion of households by type
Figure 4.16 Percentage of incarcerated residents
Ten percent of households do not have an automobile, and 97.6% have a telephone. So-called land line telephones may start to fall as apartment dwellers, especially students, begin to rely exclusively on cell phones. Just under 99% of households have complete plumbing facilities (running water, bath or shower, flush toilet), up from 54.7% in 1940.
How much income do these households make? What is the distribution of income? One way of assessing the distribution is to use quintiles to measure dispersion. A quintile is one fifth, or 20%, of a group. Thus the top income quintile represents the top 20% of income earners, the next represents those ranking 60%–80%, and so on. Figure 4.17 "Income shares for three quintiles" shows the earnings of the top, middle, and bottom quintiles.
Figure 4.17 Income shares for three quintiles
Figure 4.19 Family income, cumulative percentage change
Real income gains in percentage terms have been larger for richer groups, even though the poor have also seen substantially increased incomes.
If the poor have fared less well than the rich in percentage terms, how have African Americans fared? After World War II, African American families earned about 50% of white family income. This ratio has risen gradually, noticeably in the 1960s after the Civil Rights Act—legislation that prohibited segregation based on race in schools, public places, and employment—that is credited with integrating workplaces throughout the southern United States. African American family income lagged white income growth throughout the 1980s but has been rising again, a trend illustrated in Figure 4.20 "Black family income as a percentage of white income".
Figure 4.20 Black family income as a percentage of white income
There have been three major inflations in the past century. Both World War I and World War II, with a large portion of the goods and services diverted to military use, saw significant inflations. In addition, there was a substantial inflation during the 1970s, after the Vietnam War in the 1960s. The price level fell during the Great Depression, a prolonged and severe economic downturn from 1929 to 1939. Falling price levels create investment problems because inflation-adjusted interest rates, which must adjust for deflation, are forced to be high, since unadjusted interest rates cannot be negative. Changes in the absolute price level are hard to estimate, so the change is separately graphed in Figure 4.22 "CPI percentage changes".
Figure 4.21 Consumer price index (1982 = 100)
Moreover, a much greater fraction of expenditures on food are spent away from home, a fraction that has risen from under 15% to 40%.
Figure 4.23 Food expenditure as percentage of income, and proportion spent out
Figure 4.24 After-tax income shares
There are approximately 100 million households in the United States.
The number of residents per household has shrunk, from over four to under three, over the past 100 years.
About 60% of households live in single-family detached homes.
Slightly less than 0.5% of the population is incarcerated in state and federal prisons. This represents a four-fold increase over 1925 to 1975.
Ten percent of households do not have an automobile, and 97.6% have a telephone.
Just under 99% of households have complete plumbing facilities (running water, bath or shower, flush toilet), up from 55% in 1940.
A quintile (or fifth) is a group of size 20%.
The earnings of the top quintile fell slightly until the late 1960s, when it began to rise. All other quintiles lost income share to the top quintile starting in the mid-1980s. Figures like these suggest that families are getting poorer, except for an elite few. However, families are getting richer, just not as fast as the top quintile.
Just after World War II, African American families earned about 50% of white family income. This ratio has risen gradually, noticeably in the 1960s after the 1964 Civil Rights Act.
The consumer price index (CPI), which adjusts for what it costs to buy a “standard” bundle of food, clothing, housing, electricity, and other items, is the most common price index.
There have been three major inflations in the past century, associated with World War I, World War II, and the 1970s. The price level fell during the Great Depression (1929–1939).
The cost of food has fallen quite dramatically over the past century.
Have prices actually risen? Economists generally agree that the meaning of “prices have risen” is that you would prefer past prices to current prices. What makes this challenging is that the set of available products change over time. Cars have gone up significantly in price but are also more reliable. Would you be better off with your current income in 1913 than today? You would be very rich with current average income in 1913 but would not have access to modern medicine, television, electronics, refrigeration, highways, and many other technologies. If you made $40,000 annually in 1913, how would you live and what would you buy? (Do some research.)
Compare a $40,000 income in 1980 to the present. What differences are there in available products? In the quality of products? How rich does $40,000 make you in each time period? In which period would you choose to live, and why?