At least, you need a decent grade of calculus, linear algebra, probability theory and statistics. In addition, it is suggested to take some econometrics classes. Also your economics background has to be strong. Otherwise, you would fail when you take classes together with Econ PhDs. Take your time. Background takes time to build up.
It also helps to take some PhD level classes directly.
I asked my audit professor who earned her Acct Ph.D several years ago the same question, and she replied: " I do not think that taking math classes is necessary unless a PhD program requires a particular course that you have not taken. For instance, some PhD programs require you to take Calculus while you are getting your degree. For most research you do not use math skills." Hope this is helpful.
I asked my audit professor who earned her Acct Ph.D several years ago the same question, and she replied: " I do not think that taking math classes is necessary unless a PhD program requires a particular course that you have not taken. For instance, some PhD programs require you to take Calculus while you are getting your degree. For most research you do not use math skills." Hope this is helpful.
my second question is how i can build up maths background. does summer school work? any recommendation?
Math and stats are prerequisites when you apply (if you look at the website). Also, I think you may want to build up your math background because you will be competing with people who has a math, stats or economics degree (in my year, all candidates but me have two degrees).