On June, 11th, The New York Times pub­lished a story on the just-​​released Sur­vey of Con­sumer Finances (SCF) titled “Fam­ily Net Worth Drops to Level of Early ’90s, Fed Says”. The SCF is a cross-​​sectional sur­vey of U.S. fam­i­lies which has been done every three years since 1989 and includes infor­ma­tion on fam­i­lies’ bal­ance sheets, pen­sions, income, and demo­graphic char­ac­ter­is­tics. The New York Times’s story begins:

The recent eco­nomic cri­sis left the median Amer­i­can fam­ily in 2010 with no more wealth than in the early 1990s, eras­ing almost two decades of accu­mu­lated pros­per­ity, the Fed­eral Reserve said Monday.

A hypo­thet­i­cal fam­ily richer than half the nation’s fam­i­lies and poorer than the other half had a net worth of $77,300 in 2010, com­pared with $126,400 in 2007, the Fed said. The crash of hous­ing prices directly accounted for three-​​quarters of the loss.

Net Worth by Percentile

The tables at this link are taken from the SCF and show that these num­bers are in con­stant 2010 dol­lars. The graph to the right shows these inflation-​​corrected num­bers since 1989. It’s click­able, so you can see it in full size.

As you can see, the top 10 per­cent has such a high rel­a­tive net worth that the changes in the lower per­centiles are dif­fi­cult to dis­cern. Hence, below is the same graph but going only up to a net worth of $240 thousand.

Net Worth by Percentile to 240KAs you can see, median fam­ily net worth in 2010 was just about where it was in 1992, 18 years ear­lier. Hence, the eco­nomic cri­sis did erase “almost two decades of accu­mu­lated pros­per­ity” as stated in the arti­cle for the median fam­ily. For the mean fam­ily, how­ever, it just erased almost one decade of accu­mu­lated prosperity.

Table 4 of the 2010 SCF (from whence this data came) gives fam­ily net worth, by selected char­ac­ter­is­tics of fam­i­lies, from the past eight sur­veys (1989 through 2010). It gives both the mean and the median of the sub­groups deter­mined by these char­ac­ter­is­tics so it’s impor­tant to under­stand the dif­fer­ence between these two terms. Briefly, the mean of a series of num­bers is the “aver­age”, com­puted by divid­ing the sum of the num­bers by the count of the num­bers in the series. The median, on the other hand, is the “mid­dle” value when the num­bers are arranged in order of value. If there are an even num­ber of val­ues, it is the aver­age of the two mid­dle val­ues. Hence, the series 1, 2, and 6 has a mean of 3 (9 divided by 3) and a median of 2 and the series 1, 2, 3, and 6 has a mean of 3 (12 divided by 4) and a median of 2.5. Note that in both of these cases, the mean is greater than the median. This is because the rel­a­tively high value of the last num­ber in the series (the 6) pulls up the mean more than it does the median. This is impor­tant to remem­ber in inter­pret­ing the num­bers in table 4.

The first graph above shows the over­all mean and median fam­ily net worth. Note that the over­all mean is much higher than the median and is just below the median of the 75th to 90th per­centile. This is because, like the exam­ple above, the major­ity of fam­i­lies have a net worth less than the mean. In fact, the above graph would indi­cate that about 80 per­cent of fam­i­lies have a net worth below the mean.

One use­ful thing about look­ing at the medi­ans of per­centiles is that the median rep­re­sents the cen­tral per­cent of the per­centile. That is, the medi­ans of the 0 to 25, 25 to 50, 50 to 75, 75 to 90, and 90 to 100 per­centiles rep­re­sent the 12.5, 37.5, 62.5, 82.5, and 95 per­centiles, respec­tively. That is because per­centiles, like medi­ans, are obtained by arrang­ing the series by order of value. Hence, the data shows that 50 per­cent of fam­i­lies had a net worth less than $77,300 in 2010 and three-​​quarters of those fam­i­lies (37.5 per­cent of all fam­i­lies) had a net worth less than $32,200. This and the other data shown in the graphs above show that net worth is strongly skewed toward the upper percentiles.

The fol­low­ing table gives the data in the above graphs as dis­played from the tables at this link:

Median Fam­ily Net Worth, by Selected Char­ac­ter­is­tics of Families

1989–2010 Sur­veys (thou­sands of 2010 dollars)

Per­centile of net worth 1989 1992 1995 1998 2001 2004 2007 2010 % change 2007–2010
Less than 25 0.3 0.8 1.3 0.7 1.4 2.0 1.3 - (100.0)
25–49.9 35.5 35.8 40.0 43.6 50.1 50.2 56.8 32.2 (43.3)
Median for All Families 79.1 75.1 81.9 95.6 106.1 107.2 126.4 77.3 (38.8)
50–74.9 146.1 132.8 134.7 160.7 193.6 196.7 230.8 157.2 (31.9)
Mean for All Families 313.6 282.9 300.4 377.3 487.0 517.1 584.6 498.8 (14.7)
75–89.9 354.6 309.4 313.3 413.6 528.0 586.7 601.2 482.7 (19.7)
90–100 1,161.3 1,007.9 967.8 1,195.6 1,602.6 1,645.5 1,991.9 1,864.1 (6.4)

The last col­umn shows the per­cent change net worth from 2007 to 2010. As you can see, the great­est per­cent loss to net worth was to the lower per­centiles. The per­cent loss to the low­est 25 per­cent, sec­ond 25 per­cent, third 25 per­cent, next 15 per­cent, and top 10 per­cent were 100, 43.8, 31.9, 19.7, and 6.4 per­cent, respec­tively. Hence, the bur­den of the recent eco­nomic cri­sis weighed most heav­ily on those with the low­est net worth, at least in per­cent­age terms.