The ledger of the Venetian bookseller Francesco De Madiis, known as the Zornale (1484-88), which is currently being studied by Cristina Dondi and Neil Harris, offers a unique insight into the market value of the earliest printed books, of any sort. The essay offers the analysis of a variety of subjects, prices, sales, customers, and comparison with the cost of living in Renaissance Venice, the largest place of production and distribution in 15th-century Europe. The focus is first and foremost on the cheapest and most popular items, a production and trade enabled by the new technology.