what do u think is the most profitable business in the world??

Any profitable business depends on the market. That is why, it is hard to compare which business is more profitable than the others because businesses caters to different kinds of market which are changing eventually through time. So if you want a profitable business, study first the market of your planned business and start from there.

Whatever business it is, the profitable business would be something you know well and learned most things about the business and moreover selling those items with conscientious. It will give you profit for life long. Just search what is people searching or needing for around you. Start it as your own business. By the way welcome to mylot.