Social entities as products of convention: As an alternative to ‘compact’ or ‘agreement,’ the legal theorist Samuel Pufendorf, in De Officio Hominis et Civis (1673), uses the term ‘convention’ as the basis for law and language. He argues that conventions do not need to be explicitly formed or agreed to. Instead, we can have tacit conventions—i.e., conventions that we may not even be aware we have. Hume greatly advances the analysis of convention and of social phenomena in terms of it (Hume 1740). He expands the scope of convention to include a wide variety of social entities—not only law, property, and language, but also money, government, justice, and promises.