People are capable of extraordinary deception when their interests are at stake. Never let trust replace verification.
We like to believe that most people are fundamentally honest.
We assume that colleagues are telling us the truth, business partners are acting in good faith, and people making important promises intend to keep them.
Often, these assumptions are justified.
But there is a dangerous mistake in assuming that because we would never tell a particular lie, someone else wouldn’t either.
Our own standards of honesty are not reliable measures of how far another person might be willing to deceive us.
What the Research Shows
In a 2010 study published in Human Communication Research, Kim Serota, Timothy Levine, and Franklin Boster examined the prevalence of lying among 1,000 American adults.
The results revealed something important.
Approximately 60% reported telling no lies during the previous 24 hours. However, nearly half of all reported lies came from just 5% of respondents.
The researchers concluded:
“Most reported lies are told by a few prolific liars.”
Deception is not evenly distributed. A relatively small number of highly dishonest people may account for a disproportionate amount of it.
This challenges the assumption that everyone is equally dishonest—or equally trustworthy.
The Problem of Detecting Lies
In a 2006 meta-analysis covering 206 studies and nearly 25,000 judges, Charles Bond and Bella DePaulo examined people’s ability to distinguish truth from deception.
Their finding was striking: people correctly classified truthful and deceptive statements only 54% of the time under the experimental conditions studied.
This is barely better than chance.
Meanwhile, economist Uri Gneezy demonstrated in Deception: The Role of Consequences (2005) that people’s willingness to lie can depend on the benefits they receive and the harm imposed on others.
Together, these findings expose a dangerous combination:
Some people lie frequently, incentives can encourage deception, and our ability to recognize lies is limited.
Why This Matters
In business, the consequences of believing a lie can be substantial.
Someone might exaggerate their capabilities, conceal financial difficulties, misrepresent their intentions, invent achievements, or promise outcomes they have no intention of delivering.
The problem is that dishonesty does not necessarily announce itself through obvious behavior.
A deceptive person may appear confident, competent, sincere, and entirely trustworthy.
And the more consequential the decision, the greater the potential cost of misplaced trust.
The Practical Principle
When making an important decision involving another person’s claims or promises:
- Examine incentives. What does the person gain if you believe them?
- Verify material claims. Seek independent evidence rather than relying entirely on testimony.
- Investigate inconsistencies. Do not explain away contradictions merely because you like or trust the person.
- Distinguish words from behavior. Examine what people have actually done, particularly when their interests were at stake.
- Protect against deception. Use appropriate contracts, independent checks, staged commitments, and clear accountability.
This principle is not an argument for treating everyone as dishonest.
Trust is essential for cooperation, and most people are not prolific liars. Furthermore, an incorrect statement is not necessarily a deliberate lie.
The objective is to avoid allowing your expectations about human honesty to substitute for evidence.
The fundamental insight is that people may be willing to tell lies you would never consider telling—and you may be less capable of detecting them than you think.
Trust people where appropriate.
But when the stakes are high, verify what matters.
References
- Serota, K. B., Levine, T. R., & Boster, F. J. (2010). The Prevalence of Lying in America: Three Studies of Self-Reported Lies. Human Communication Research, 36(1), 2–25.
- Bond, C. F., Jr., & DePaulo, B. M. (2006). Accuracy of Deception Judgments. Personality and Social Psychology Review, 10(3), 214–234.
- Gneezy, U. (2005). Deception: The Role of Consequences. American Economic Review, 95(1), 384–394.
- Levine, T. R. (2014). Truth-Default Theory: A Theory of Human Deception and Deception Detection. Journal of Language and Social Psychology, 33(4), 378–392.