Figure 1

Trajectories of household income from 1 month to 15 years of age. Note: Assessment points are denoted in years (rather than grades or months) in order to more clearly depict the unequal spacing between assessments. Thus, the kindergarten assessment is shown at 5 years, the grade 1 assessment is shown at 6 years, the grade 3 assessment is shown at 8 years, the grade 4 assessment is shown at 9 years, the grade 5 assessment is shown at 10 years, and the grade 6 assessment is shown at 11 years.