Well finding the "best" of anything is somewhat debatable but yet you can find part of the "best" colleges and universites in the states in second degree ecnomics:
http://www.graduateshotline.com/study/economics.html
http://econ-www.mit.edu/graduate/index.htm - was ranked as the best...
in this link you will find that Harvard, MIT and Stanford are the US best and ranked top 10 at the world.
Yet I know that there are many other.
THIS IS THE BEST LINK OF INFORMATION:
It holds rankings according to the specific fields in graduate studies:
http://www.econphd.net/rankings.htm
click on the microeconomic theory - you will find that T.A university is number 2...
Good luck...
The search for people who can answer your question continues for as long as needed - until you find the answer you were looking for.
When an answer is posted by someone who was invited (byYedda or by yourself) to answer your question, their answer is marked with a yellow "invited by Yedda".
To be invited to answer other people's questions in your areas of knowledge and interest, be sure to list your favorite topics:
» My Settings My Topics.
Of course, the more helpful your answers are, the more likely you are to be invited to future questions...