A bookshop is a special kind of business where the owner buys books from publishers and sells them to readers to make a profit. To run the shop successfully, the owner must be very careful with money and record every transaction in a ledger or a computer system. The shop's most important assets are the books in stock, which are known as inventory, and the owner must keep track of which books are selling quickly and which ones are not. Every time a book is sold, the owner earns revenue, but they must also subtract the cost of buying the book and other expenses—like rent, electricity, and salaries—to calculate the true profit. By keeping these accurate records, a shopkeeper can understand if their business is growing and whether they have enough money to buy new books for their customers.