To be completely honest, I'm not sure you have a chance at any of those schools and I'm actually familiar with all of their programs. I attended one of those dept as an undergrad. The top 3 departments you have zero chance, along with likely UCSC. The first three are top 30 schools, and UCSC is an outlier. Its ranked lowly, because the program is narrow. It is however, one of the top departments in the narrow area it works on, and places like any other good program. Most of the admitted candidates in those schools, will have high GPA, lots of advanced math course work, and some will have advanced economics coursework, glowing letters, and good GRE.
UCSB, UC Irvine, Colorado are good second tier programs and their applicants are going to generall be fairly good though they may take some chances on weaker candidates.
U oregon, you may have a chance but I wouldn't say its 100% chance. The program gets attention because it has a good macro curriculum under Evans. Even if I was admitted there, I would have mixed feeling about attending if your interests are trade.
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I think the best course of action for you really is to take an extra year at UCSD and wait another cycle. They are a top department, doing well in the right courses there could get you into a very good department, thats only provided that you have the right foundation, and have impressed professors to get glowing letters. I think a lack of math background, and weak undergraduate is going to other wise kill your chance at any top 50 department.
I'd try to formulate plan which included completing the following courses
Math 31 AH (Honours Linear Algebra)
Math 31 BH ( Honours Multivariable Calculus)
Math 20 D Differential Equations
Math 109 Mathematical Reasoning (Intro to Analysis)
Msyh 181A Mathematical Statistics
If you aren't allowed to take that take math 20C, 20D (Differential Equations ,20F (linearl Agebra)
Econ courses completing the Econ 100 A/B/c or AH/BH (Micro)
If you take all of that and get mostly A's will probably bring your application to the level where you'll be competitive for UCSB, UC Boulder , UC Irviine, and possible UCSC. You might have an outside shot at UBC, UCD Davis, UCI. It depends on the timing of courses on the Math, it should be doable in one year. If your 100% on the PhD, it will be well worth it. Keep in mind that most students going into PhD programs have much more math, good grades, are smart intellegent and hardworking. Despite all of this many of them struggle, and PhD completion rates for Econ PhDs are relativel low. Even if you do manage to get into a PhD, would you want to go in really this underprepared?