Greg Mankiw’s posted a short class autobio. Highlight:

My parents made what must have been a significant financial sacrifice for them to send me to a good private school, where most of the other kids were from families higher up the socioeconomic ladder (doctors, lawyers, etc). Being reasonably successful at that school got me into Princeton (and also Yale, Stanford, and MIT, but not, alas, my first choice, Harvard, which wait-listed me).