From what I have gathered from this forum, the followings are minimum requirement to get into top schools:
1. GPA 3.6 or above in math and Econ
2. GRE close to 800
3. Standard Math requirement: Cal 1-3, Linear & Matrix Algebra, Differential Equation, Prob and Stats (econometrics would be added bonus), a proofing course like Advanced Calculus, Logics and Set Theory, or Real Analysis.
Standard Econ Requirement: Intermediate Macro and Micro theory
4. Strong (not good)
LOR's, I assume most if Not all
LOR's are good.
5. I beg to differ that graduate course work or degree (master degree) can boost your profile significantly.