Whether your online business succeeds can depend on how much competition exists in that sector. Data from shopping software provider Bigcommerce suggests that there's not much money in food or books, but you can do well in cars or jewellery.
Cart picture from Shutterstock
As you can see in the infographic below, the average order size and growth in competition varies hugely between different sectors. That doesn't mean you can't succeed in some of these slow-growth spaces, but you'd need a very clear marketing strategy and a solid point of differentiation from competitors