Credence [better]

Expected utility theory relies on credence: an agent chooses action ( A ) that maximizes [ EU(A) = \sum_i Cr(O_i) \cdot U(O_i) ] where ( O_i ) are outcomes and ( U ) utility. Without credence, rational choice under uncertainty collapses.

Because credence is difficult to self-claim, you need witnesses. Testimonials, case studies, audits, and peer reviews are the scaffolding of credence. You don't claim to be a good lawyer; your AVVO rating claims it.

Evidence or information can "lend credence" to a theory, meaning it makes that theory more believable. Credence

The wise path is provisional credence : Trust, but verify. Accept, but audit. Listen, but triangulate.

In microeconomics, there is a specific category of products that rely entirely on credence: . Expected utility theory relies on credence: an agent

While often used interchangeably with "belief," credence carries a distinct, heavier weight. It is not merely an opinion held; it is the mental acceptance of something as true, often coupled with a readiness to act upon it. To give credence to an idea is to open the door of your mind and let it take residence, influencing your perception of reality and your choices within it.

To fully grasp the concept, we must look at its etymology. The word comes from the Latin credentia , meaning "belief" or "trust." It shares a lineage with credibility , credit (as in financial trust), and credo (a statement of belief). Testimonials, case studies, audits, and peer reviews are

An author writes a book with many claims, each of which she has high credence (>0.99). She justifiably believes each claim. However, knowing her own fallibility, she has high credence that at least one claim is false (e.g., Cr(error) = 0.95). Thus she believes both “Every claim in the book is true” and “At least one claim is false.” Again, inconsistency.

As a consumer of information, you need a heuristic—a mental shortcut—for deciding what deserves your credence.

Biologists call it the "handicap principle." A peacock’s tail is expensive to grow and dangerous to carry; that is why it is an honest signal of fitness. Similarly, a company that offers a "lifetime guarantee" or a "free 90-day trial" is sending a costly signal. They are betting their resources on their claim, which forces you to give credence.