B.A Economics

B.Sc focuses on the mathematical side of economics. In BA, if you take mathematics and econometrics along with the rest of the courses, then there won't really be any difference between a B.Sc and BA.

Absolutely worth with best ROI and best aspirational brand value, amongst top 5 B-School on India. For placements and eligibility see below.
https://www.shiksha.com/mba/course/post-graduate-program-management-indian-institute-management-iim-a/1653

Hi Nitin,
The admission process and requirements are different. First, you must decide which country you want to go to as your marks are good. You can apply for top universities, though admission is not a guarantee anywhere. You can take IELTS or TOEFL. You must also take SAT depending, where you want to go.

Yes, it is very nice to pursue interior designing course along with BA in economics. But, you should be sure about your interest. If you don't have interest in doing design then you should not do this.

Dear,
There is no comparison of the two fields because both having different market demand and challenges.
If you want to work in a bank or financial institution, opt for MBA after completing BA (Hons) in economics.
Following are the good colleges for pursuing MBA:
1. ISB, Hyderabad
2. Narsee Monjee, Mumbai

Yes, it is possible. Some universities permit any graduate to pursue MA in economics through distance education but demand BA in economics degree to pursue MA in economics in regular mode.