Can early childhood interventions compensate for innate deficits? In this paper, I study the forced right-hand writing of left-handed children (“switching”). While previous literature has found that, due to innate cognitive deficits, left-handers obtain less human capital and lower wages...

In the presence of heteroskedasticity, conventional standard errors (which assume homoskedasticity) can be biased up or down. The most common form of heteroskedasticity leads to conventional standard errors that are too small. When Wald tests based on these standard errors are insignificant,...