1 out of 1 members found this post helpful.
First, your academic job market prospects will be considerably better with a PhD Accounting than a PhD Economics. Graduate stipends from business schools also tend to be more generous.
Second, at least at my school, PhD Accounting students have to take the Micro and Metrics sequence. I would say that at many places that if you do well in those courses, then it will be relatively easy to transfer programs (bearing in mind that it will likely reduce your funding). To be eligible for funding from the Econ Dept, you'll have to apply by the regular admissions deadline.
My advice is to get into the best PhD Accounting program that you can and then evaluate your options once you are in the program with respect to transferring within the university.