Should Socrates have drunk the hemlock or was Antigone right to claim that one may morally disobey political authority? What is the state for? The economic concept of "public good" is central to answering these questions in economics and political philosophy. Here's a short introduction---with some further questions. A public good (sometimes called "collective good") is something for which all members of a group are willing to pay some price, something that they will all be able to consume simultaneously,...