What? Really? Since then I've been trying to figure out where that information came from and if it were true or not. Finally, yesterday, a friend who's been working on a huge project on the achievement gap forwarded me an article (abstract) from the latest issue of the journal Child Development. In it, the authors use a large dataset to see if wealth mediates the achievement gap. Before I get to the findings, let me stop for a second and answer a question that might be in your head. Why would wealth matter more than income? In this study, Whites earn about twice as much as Blacks, but have about five the times the amount of wealth, on average. Think about it: one family that makes x dollars/year but has no money in the bank and rents an apt. will not have the same lifestyle as another family that makes x dollars/year but owns their own house and has a large portfolio of stocks and bonds.
So, what's the answer? Which one is more important? Well, it looks like . . . neither.
The authors have data on a lot more than just wealth and race, and when they include all their other variables neither race nor wealth are statistically significant predictors of achievement in most of their models (they have both reading and math scores for 3-5 and 6-12 year-olds). The variables that are most frequently statistically significant are parent's occupation and mother's cognitive ability. Depending on the model, parental education, grandparent's education, debt, stock ownership, and a variety of home environment measures are also statistically significant.
So, according to this dataset, there is no difference in achievement between blacks and whites who have parents with the same job, cognitive ability, and some other factors. I e-mailed the author to make sure I had this right before writing about it (I did). I also asked if race were still a statistically significant predictor when only controlling for wealth (I didn't see a table with only these variables in it) and I was told that it was.
So, there appear to be two main lessons out of this paper (for me, anyway).
- Race, in and of itself, doesn't seem to determine achievement level. Now, maybe it influences what kind of job somebody can get (for example), and that influences achievement level -- but if a parent is able to get that job then their kids should score about the same as other kids of parents with similar jobs regardless of their race.
- Though a better predictor of achievement than income, wealth does not fully mediate the effects of race on children. In other words, white children whose parents own a certain amount of property, stocks, etc. will out achieve (on average, of course) black children whose parents have the same level of wealth.