First of all, I think it depends on your sales target, such as what kind of people are there nearby, white-collar workers? What about the students? Or the old man in the community? According to the kind of books read by the object.
Because the Internet is relatively developed now, books sold online are generally much lower than those sold in physical stores. Want to open a bookstore, competitive, I think we must have our own characteristics. Let the guests feel that this is an enjoyable process when choosing books, and let the guests feel that this is a good place to steal time from work, rather than buying books for the sake of buying books.
Modern people have a faster pace of life. I think it would be great if there is a quiet place with green plants everywhere, comfortable chairs and a cold drink in hot summer, where I can slowly choose my favorite books.