<p>For grad school?</p>
<p>Mankiw attended Harvard Law and MIT Ph.D. economics at the same time, I think, but he dropped out of the law one, because it wasn’t really possible to finish both. But, in this as in every single one of the threads you start, why on earth would you want to?</p>
<p>I’m just curious. :D</p>
<p>Harvard and MIT offer course cross-registration, which might turn out to be a more useful option.</p>