As everyone has said Gulati is an AMAZING man. He has perfect command of the class of over 300 students and allows for an amazing amount of participation. The class is not only very interresting but quite amusing. Gulati knows how to teach econ in a way that is manageable and it is very clear that he has great command of the material as he lectures without notes and when asked an irrelevant question by some overachieving loser he simply replies with, "wait 15 minutes" or "thursday i'll answer that question" or "two courses from now" rather than digressing like others. He also tries to add a personal touch to econ and sometimes brings up relevant current events. Gulati's style and charisma are amazing, there is rarely a dull moment. Gulati is a clear choice. (Oh and if you are thinking of registering for the other class and going to gulati's lectures...not gonna work...the classes start at different places just for that reason). The downside to Gulati is that because he teaches so well he expects everyone to know the material very well and makes the exams quite difficult and long. On top of that he has the TAs introduce new material during recitation but you can go to any recitation during the week, not necessarily the one you are registered for. But the positives CLEARLY outweigh the negatives. If you go to Columbia you have to hear this man lecture , even if you don’t take the class, he's simply the greatest.