<p>Birch,</p>
<p>On average, classes at NYU aren't very large at all, esepcially the upper level ones you take after declaring a major. In fact, most classes at NYU are pretty small, only a handful (intro stuff, pre-med stuff, some MAP requirements) are over 50 students. CAS also has many seminar style courses in all subject areas, including freshmen seminars which are taught by some of NYU's top profs., among them the president of NYU (I somehow doubt the president of Cornell or most other universities of NYU's size and calibre teach freshmen in a small class setting).</p>
<p>Freshmen seminars in CAS:
<a href="http://www.nyu.edu/cas/Academic/Hon...rsSeminars.html%5B/url%5D">http://www.nyu.edu/cas/Academic/Hon...rsSeminars.html</a> </p>
<p>There are also seminars like this for upper classmen, so its not just a freshmen thing. </p>
<p>Also, if you're worried about undergrad focus-DO NOT WORRY. I can assure you undergrads at NYU recived plenty of attention.</p>
<p>Consider this:
a) the same profs teach both undergrad and grad.</p>
<p>b) undergraduates CAN take graduate classes at NYU with an advisors permission; also in the particular fields you're interested in (math and economics), CAS undergrads can also get graduate degrees from NYU at less cost, less time, and without the taking the GRE and going through the grad. school admissions process.</p>
<p>BA/MA program in CAS:</p>
<p><a href="http://www.nyu.edu/cas/Academic/Pro...ma_brochure.pdf%5B/url%5D">http://www.nyu.edu/cas/Academic/Pro...ma_brochure.pdf</a></p>
<p>Basically, at NYU you'll get plenty of undergrad. attention and large class size is not a big issue at all. </p>
<p>All 3 of your schools are great choices that you really can't go wrong in. </p>
<p>Good luck with the decision!</p>