Is there a discussion anywhere of the epistemic issues involved in timeless or acausal decision theory? For example, if it's about acausal trade between agents: how do you know about the other agent's existence and properties? How do you figure out what agents are out there, that care about what you do, and about whose actions you should care? If you don't have a rational basis for your beliefs about the existence and nature of the agents you imagine to be on the other side of an acausal trade, can you even be said to be trading?