Partly in response to increased testing and accountability, states and districts have been raising the minimum school entry age, but existing studies show mixed results regarding the effects of entry age. These studies may be severely biased because they violate the monotonicity assumption...

Using the Beginning Postsecondary Student Survey, we examine the effect on earnings of obtaining certificates/degrees from for-profit, not-for-profit, and public institutions. Students who enter certificate programs at any type of institution do not gain from earning a certificate. However,...