USC says in their pdf brochure (
http://www.usc.edu/dept/LAS/economics/grad/brochure.pdf) that they are now fully-funding all of their grad students for five years. Apparently the university is targeting the department as one it wants to bring higher-profile academics to, and as part of this effort is giving the department more money for both recruiting and graduate programs.
The funding is either 17k (plus tuition remission, etc) for five years with TA/RA duties, or 23k for two years w/o responsibilities, then three years of the TA/RA funding.