Customers trust

Trust rests on the assumption that the other party will act honestly. Yet companies protect themselves through controls, contracts, and surveillance. The implicit message: We don't trust you. The question is: How does visible trust influence people's actual behavior? Does trust make them more honest or more careless—and what does the evidence tell us?

Studies

17,000 lost wallets worldwide

Alain Cohn and his team from the University of Zurich conducted the largest honesty experiment in history in 2019. They had research assistants pose as finders in 40 countries, turning in 17,303 wallets to banks, hotels, and museums. Each wallet contained a business card with the "owner's" email address. One-third were empty, one-third contained the equivalent of $13, and one-third contained $94. The surprising result: empty wallets were returned 40% of the time, while those with $94 were returned 72% of the time. Remarkably, the more money inside, the more honestly people behaved—the opposite of what economists had predicted.

Economists were completely wrong

Before their experiment, Cohn and colleagues surveyed 279 economists from 40 countries: "What do you think—how does more money affect the return rate?" Only 20% predicted that more money would lead to greater honesty. The majority expected the opposite: greater financial incentive would lead to more theft. Even after seeing the initial results, the experts significantly underestimated the effect. Nevertheless, the data clearly showed that people don't want to see themselves as thieves, even when no one is watching. The psychological costs of dishonesty outweigh the material incentive.

The Key Effect

In a sophisticated variant, the researchers placed an ordinary house key instead of money in some wallets. These key-containing wallets were returned more frequently than those with $13—even though the key was completely worthless to the finder. The key difference: people respond to the perceived loss of the owner, not just to their own potential gain. In 38 out of 40 countries, the same pattern held true: the greater the stake for the loser, the more honestly the finders acted. The experiment revolutionized our understanding of human morality across cultures.

Principle

Which principle for Customer Experience Design can be derived from this? Systems that visibly trust customers activate their intrinsic honesty and paradoxically reduce abuse. When companies demonstrate conspicuous trust through generous return policies, self-service options, or lenient warranty terms, the psychological cost of dishonest behavior increases—customers don't want to see themselves as cheaters who abuse trust. This effect is particularly strong with visible trust signals and when the potential harm to the company is obvious, but it weakens when customers perceive the system as impersonal or automated. The following guidelines show how to implement this principle concretely.

Guidelines

Implement honor systems

Implement honor systems and communicate trust explicitly: stating "We're forgoing controls because we trust you" is more effective than silently waiving monitoring. Every verification signal sends the message "We believe you might cheat" and triggers the Golem effect. The explicit label "trusted customer" becomes internalized and positively influences future behavior. The following examples illustrate this guideline:

• Farm Stands (USA): Hundreds of farm stands across the USA operate on the honor system—completely unsupervised. The result: Most customers pay the correct amount or more. One stand in Wyoming reports: "In 2024, we had only one week with a shortfall. Most weeks we exceeded our target, thanks to tips."
• Radiohead 'In Rainbows': Released in 2007 as 'Pay What You Want'. On average, fans paid $6 – even though $0 was possible. The psychological cost of not paying for a valued artist was too high.

Create relationship instead of anonymity

Reduce anonymity through personal connections: Use the recipient's name, reference known details about their situation, and assign specific contact persons rather than anonymous teams. Handwritten elements signal special effort and trigger reciprocity. Personal connections raise the psychological cost of dishonesty. The following examples illustrate this guideline:

• Kleinanzeigen (eBay Kleinanzeigen): Profiles with names, ratings, response time. The visible identity reduces fraud because dishonesty is no longer anonymous.
• Airbnb: Mutual reviews and profile photos. The personal connection between host and guest reduces damages and no-shows.