 The same type of benefit, plus arguably others, come from a recent proposal by Chen (forthcoming). Chen suggests that we adopt a position known as density matrix realism to help understand time’s arrow. Instead of regarding the wavefunction as the basic ontology of quantum theory, we take the quantum state to be represented by an impure density matrix. When we express the Past Hypothesis in terms of a density matrix, a number of virtues appear, including greater harmony between the probabilities of statistical mechanics and quantum mechanics. It may be that interpretations of quantum mechanics that are not like GRW can possess some of the same benefits that GRW brings.