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New research from Brigham Young University shows that first-born children get about 3,000 more hours of quality time with their parents between ages 4 and 13 than the next sibling gets when they pass through the same age range.
The study provides a possible explanation for why older children tend to get more education, make more money and score higher on IQ tests. BYU economics professor Joseph Price conducted the analysis, which appears in the new issue of the Journal of Human Resources.