The first thing you should think about is what you plan to do with your degree. Are you just interested in studying for the sake of studying or have you actually thought about what you want to spend 8 or more hours of each day doing? If you are primarily interested in study, especially of highly theoretical concepts, which it sounds like you are, you should consider a career in academia.

As for an MBA, you should consider that most schools, the good ones anyway, require that you have at least a couple of years of work experience. You should also really think about if you would like doing what someone with an MBA does (i.e. like management, which you really need some work experience to judge if you’d like doing it) or are you more interested in being an analyst or technical person.

Your decision should also depend on what your undergrad degree was, what your GPA was, and what your GRE/GMAT score were. Of course, you should choose something you enjoy, but you also need to be practical. For each of your prospective choices, you should judge the demand and salary potential for someone with that knowledge. I like this website ( http://www.payscale.com/ ) for information on different careers or jobs.

Good luck with whatever you decide…