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Beliefs based on testimony are part of the web of beliefs we regularly rely on when we form a variety of expectations. This means that the hypothesis that testimony is credible plays a crucial role when we form these expectations. As a result, even if we do not deliberately seek confirmation of the credibility hypothesis, it receives tacit confirmation whenever observation matches the expectations that are in part based on the credibility hypothesis. Even if the degree of tacit confirmation by a single observation is small, there are plenty of such observations. Their cumulative effect is substantial and should be sufficient for justifying our trust in testimony.

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