hi! In a nutshell, go for a degree you are actually interested in, not just on the basis of your career. If you enjoy a particular field, you would not have to worry about career or money, as your first and foremost interest would be doing and studying something you like. That being said, I would recommend you first go through the entire syllabus and possible career options from all three degrees, and understand the various choices you have.

The Master of Economics (MEcon or MEc) is a postgraduate master's degree in economics comprising training in economic theory, econometrics, and/or applied economics. MA Political Science or Master of Arts in Political Science is a 2 years postgraduate course in India. The course provides specialized knowledge of Indian and International politics to graduate students. It can be pursued by those who wish to make their careers in the fields of governance and public management. Master of Arts in Psychology is a postgraduate course which is completed in two years, spread across four semesters. The programme is dedicated to psychology and students enrolled in the course study about human behaviour and human psychology.

Now that you know a little bit about each of them, which are you the most interested in? Once you decide, research a bit more about the various career prospects you might have. All the best!