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Pragmatic encroachment theories propose that the truth-conditions for 'S knows that P' depend on the practical stakes involved in acting on that belief—when the costs of error are high, higher justification is required. This explains why we might count someone as knowing in low-stakes contexts but not in high-stakes contexts, even though their evidence remains unchanged. The view connects epistemology to practical reasoning and explains the rational significance of evidence.
Consider cases where practical stakes affect what would count as 'knowing': high stakes (medical diagnosis) require higher justification than low stakes (casual conversation). Examine whether this is about knowledge content or rational action standards.
From your study of contextualism, you know that one influential response to skeptical puzzles is to say that the standards for "knowledge" vary with context — specifically, with the conversational or attributional context of whoever is making the knowledge claim. A casual conversation about whether the bank is open invokes lower standards than a philosophy seminar, so "S knows the bank is open" can be true in the first context and false in the second. Pragmatic encroachment makes a different and more radical claim: it is not the attributor's context that matters, but the subject's own practical situation. The stakes S faces — the costs of error for S acting on the belief — directly affect whether S knows, not merely whether the knowledge claim sounds true.
The canonical case is Jeremy Hawthorne and Jason Stanley's bank cases. In the low-stakes version, Hannah and her husband plan to deposit a paycheck on Saturday; they drove past the bank earlier and both have mild evidence it will be open. Hannah says "I know the bank will be open." In the high-stakes version, the paycheck must be deposited or they will miss a mortgage payment with serious consequences. Same evidence, same bank, same past visit — but now, intuitively, Hannah's claim to know seems weaker or false. Contextualists say this is because the high-stakes context raises the conversational standards for the word "know." Pragmatic encroachment theorists say something more interesting: Hannah genuinely knows in the low-stakes case but genuinely does not know in the high-stakes case, because her evidential position — unchanged — is not adequate to her practical situation. Knowledge is not just about having enough evidence; it is about having enough evidence *given what you're doing with it*.
The key distinction is that pragmatic encroachment is a claim about knowledge itself, not about the language of knowledge attribution. This is not semantic contextualism (where "knows" picks out different standards in different contexts) but a thesis about the metaphysics of knowledge: practical factors are constitutive of whether the epistemic relation obtains. The view has an intuitive rationale: knowledge is the kind of mental state we use to act on, and a belief that would guide reasonable action in low-stakes conditions might be epistemically inadequate for high-stakes action — not because the belief changed, but because the action it must support changed. In this sense, pragmatic encroachment treats knowledge as inherently action-guiding in a way pure evidential accounts do not.
The view also generates a coherent explanation of why it is rational to seek more evidence before acting in high-stakes situations, even if you already "know" something in everyday terms. If knowledge standards rise with stakes, then being in a high-stakes situation means your prior evidential base no longer constitutes knowledge — you genuinely need more justification to know again. Critics push back: they worry that this collapses knowledge into rational action (since both scale with stakes), and that it makes knowledge hostage to brute facts about your bank account. Defenders respond that the worry conflates knowledge with belief: practical stakes do not make your evidence worse, but they do make a higher evidential bar necessary for the epistemic state we care about — knowledge rather than mere reasonable belief. Situating pragmatic encroachment against contextualism clarifies that these are competing explanations of the same data (context-sensitivity of knowledge claims), and deciding between them requires examining whether the relevant variation is in the language used to ascribe knowledge or in the epistemic facts themselves.
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