Many have found it plausible that practical circumstances can affect whether someone is in a position to know or rationally believe a proposition. For example, whether it is rational for a person to believe that the bank will be open tomorrow, can depend not only on the person's evidence, but also on how practically important it is for the person not to be wrong about the bank being open tomorrow. This supposed phenomenon is known as "pragmatic encroachment" on knowledge and rational belief. Assuming that the phenomenon is real, I ask what explains it. I argue that a variant of instrumentalism about epistemic reasons offers a natural explanation, that at the same time is able avoid commitment to a more radical form of pragmatism.The rest of the paper will proceed as follows. In §2, I introduce the phenomenon of pragmatic encroachment. In §3, I introduce some of the difficulties facing explanations of pragmatic encroachment by discussing one of the main proposals for such an explanation, namely that of Mark Schroeder. In §4, I introduce my transmission-based version of epistemic instrumentalism, that I rely on to explain pragmatic encroachment in §5, where I also show how this explanation avoids the difficulties faced by Schroeder's account, and avoids commitment to a more radical form of pragmatism. §6 is a brief summary and conclusion.
Pragmatic EncroachmentWe can introduce the phenomenon of pragmatic encroachment by considering the sort of cases that are often taken to motivate it. 3 Here is a set of cases from Schroeder (2012a: 266-7), adapted from Stanley (2005) and DeRose (1992). Consider first Low Stakes: Low Stakes: Hannah and her wife Sarah are driving home on a Friday afternoon. They plan to stop at the bank on the way home to deposit their paychecks. It is not important that they do so, as they have no impending bills. But as they drive past the bank, they notice that the lines inside are very long, as they often are on Friday afternoons. Hannah remembers the bank being open on Saturday morning a few weeks ago, so she says, 'Fortunately, it will be open tomorrow, so we can just come back.' In fact, Hannah is right -the bank will be open on Saturday. Many philosophers share the intuition that Hannah's belief that the bank will be open could plausibly be considered epistemically rational. Her memory of seeing the bank being open a few weeks ago (coupled with relevant background knowledge) seems sufficient epistemic reason for her to believe that the bank will be open. 4 But contrast now Low Stakes with High Stakes: High Stakes: Hannah and her wife Sarah are driving home on a Friday afternoon. They plan to stop at the bank on the way home to deposit their paychecks. Since their mortgage payment is due on Sunday, they have very little in their account, and they are on the brink3 Not all proponents of pragmatic encroachment base their arguments primarily on intuitions about cases such as these. For example, Fantl & McGrath (2007; argue that pragmatic encroachment follows from fallibilism about knowledge and ...