I want to do research that should have presence globally and I am working in India in Bank
I think I understand what you mean. You want to conduct research using the place you work, but you don't want it to just be about how things are in India.
Well, the first thing to do is read lots of research studies that are similar o what you have in mind? Can you find 4 or 5 studies that are similar to what you want to do? It's very important that you use your school's database and read all the recent papers that have been published in scholarly journals about marketing. It is impossible to get started on your own project until you see what is being done lately. You can build on someone else's work, or you can reprodue someone else's study with a different focus.
It's just like entering a conversation that is happening: You need to see what everyone else is saying right now before you "say" something by writing this dissertation. Otherwise you might repeat what has just been said.
So... read lots of articles similar to what you want to write, and you will see that their Literature Reviews are all similar. That is because they are all about the same topic, which is the topic you chose. Consequently, your literature review will look a lot like theirs, too. The literature review is a review of what is happening in the ongoing "conversation" about buying behavior.
:-) I hope that helps!!
Do You Need