ABSTRACT
Some ontological commitments are described as 'dubious'. To get a better sense of exactly what is meant by the term 'dubious', this chapter introduces in some detail an instance of an allegedly dubious property. In the process of explicating what is objectionable about the Lucretian properties, Sider likens Lucretian properties to various other posits, all of which are also said to be dubious. The demand for truthmakers threatens the presentist. The moon-skeptic position seems to closely mirror the Lucretian presentist position. The methodology that the presentist appears to be pursuing seems to be: find an ungrounded truth and posit a new truthmaker. In conjunction with some account of what it is to be dubious, truthmaker is supposed to help one to rule out particular positions. Truthmaker is to be motivated by its ability to rule out particular positions in metaphysics.
