Information goods encompass cultural goods, information-processing goods and external information goods. They consist of symbols, signals, signifiers, which are the semantic elements of information. In consequence, they have common characteristics: ease of access, abundance of copies and variations, and networks of attachment between those agents who share information. The chapter discusses the consequences of confronting easy access with private property norms, of controlling abundance through practices of selection, and of dealing with peaks and long tails in networks of attention and attachment. The markets that have formed around the various types of information goods reflect these essential features.