CA

In my opinion, an MBA definitely has more scope than a CA due to the following reasons:
Most of the IIMS and other good B schools prepare you for general management. They teach you the basic skills needed for each kind of management role, and then you are allowed to specialize in your desired stream later. This gives you a much broader exposure, while a CA restricts you more or less to an accounting role. If you have an MBA, chances are your career progression will be faster as compared to those who don't. This should be true in most of the careers. An MBA is extremely hectic, and the rigor of the programme teaches you a lot of extremely essential skills like time management and hard work. The companies know about the rigor of MBA programmes and value these skills. In case you want to become a CEO or a top manager, it is practically very difficult to reach that position in today's competitive world if you don't have an MBA. The kind of professional networks you build during an MBA will stay with you for the rest of your life and will help you whenever you need professional help or favors. Note that I have very limited knowledge of CA so take my words with a pinch of salt. My answer is based mostly on the interactions I have had with some of my peers at IIMA who are from a CA background.

Hello,
As you are interested in economics, you can go for teaching or research in it. There are UGC NET exam is organized for the candidates who want to become assistant professor or junior research fellowship also called JRF. As you have completed the M.Sc. You are eligible to apply for UGC NET Exam for lectureship. If you want to apply for JRF, make sure that you are under 30 years old. After qualifying the NET Exam you might have following career options:
Become assistant professor at top institutes and colleges
Get a scholarship or fellowship awards
Become guest lecturer
Open an institute or coaching
Get a job in PSUs or government sector
Get a job in Administration
Become an author or publish a book
Become a counsellor etc. UGC NET will open many option after Post Graduation. On the other hand MBA will make you eligible for management and business profile. Now, it is all up to you in which filed you want to go. All the best.