Although not commonly stated in pre-transfer advising, economics majors considering PhD study in economics or work in quantitative finance should consider taking multivariable calculus (De Anza MATH 1C-1D), linear algebra (De Anza MATH 2B), and differential equations (De Anza MATH 2A) before transfer, in order to prepare for the more quantitative intermediate economics courses (at UCB, UCSD, UCI, UCSC) and upper division math courses.
Here are some recommendations from the UCB economics department:
https://www.econ.berkeley.edu/undergrad/current/preparing-for-grad-school