Table 6.

Effect of Interaction on Productivity

Dependent Variable: ln Wage Rate in 1992
	(1)	(2)	(3)
Panel A: Main Effects
Neuroplasticity Genes	−0.0634 (0.0392)	−0.0659* (0.0397)	−0.0413 (0.0840)
Standardized Birth Weight	0.0507 (0.0473)	0.0531 (0.0476)	0.0997 (0.0788)
Controls
Demographic and Family SES	Y	Y	Y
Sibling Fixed Effects	N	N	Y
Estimation
Weighting by Prob. of Being in Sib Sample	N	Y	N
N	820	820	820
R Sqr.	0.0933	0.0957	0.6008
Panel B: Gene-Environment Interaction
Neuroplasticity Genes	−0.0613 (0.0394)	−0.0635 (0.0399)	−0.0213 (0.0832)
Standardized Birth Weight	0.1221** (0.0523)	0.1204** (0.0522)	0.3156*** (0.1030)
G × E	−0.0237* (0.0129)	−0.0226* (0.0126)	−0.0666*** (0.0207)
Controls
Demographic and Family SES	Y	Y	Y
Sibling Fixed Effects	N	N	Y
Estimation
Weighting by Prob. of Being in Sib Sample	N	Y	N
N	820	820	820
R Sqr.	0.0950	0.0972	0.6069

Notes: (i) Neuroplasticity Genes is the additive genetic risk score of plastic alleles for APOE, BDNF, and COMT. G × E represents the interaction between our measure of neuroplasticity and standardized birth weight. (ii) Demographic and family controls include race, sex, birth year (age), birth order, mother’s education, father’s education, and a score for family SES in 1957. (vi) Standard errors are clustered at the family level with *, **, and *** representing significance at the 10, 5, and 1% significance level, respectively.