A topic for research

As you may have done some preliminary work on the areas in which you wish to do your Phd, it could be better shared with learned members, so that they can contribute / share their views on the topic chosen from your end. They may later jump in to give you betterr ideas too...!!!

Ooooopppps initially you said Accounts, but good that you clarified your area of interest is stock market.As the stock market covers wide gamut of concepts and emerging products, I would leave that domain to be answered by stock market specialist sir, as I am not competent to discuss on stock market related topic. Hopefully, learned scholars would suggest you a good topic to pursue your Phd. All the very best.