I found this to be an excellent overview/introduction to the world of bars/pubs/taverns. Note, I did not list restaurants, that is an entirely different animal.
What this book provides for the reader, in it's 300+ pages, is the 100,000-foot view at running a service-based enterprise. The authors cover everything from selecting a name, writing your business plan, financing, obtaining equipment, hiring and training your staff, and making sure you reap the benefits of repeat business.
I have a few other starting a business books that are focused on starting one's own brewery or brewpub, and this book (albeit more generalized) would fit nicely on the same shelf; however, for the person who says to themselves "hey, I am yet another who wants to open a bar and quit my real job", this book would serve them well, to ensure they have the wherewithal to open a pub. After all, running anything in the customer service-industry is a real job, if not the king of real jobs.