
In "How Trust Works," USC professor Peter Kim shatters conventional wisdom: trust isn't always earned gradually. His award-winning research reveals why a single bad act outweighs lifetime goodness, and why apologies work for competence violations but not integrity breaches. Featured in NYT and NPR.
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Think about the last time someone let you down. Maybe a friend broke a promise, or a company failed to deliver what they advertised. Your first instinct was probably to pull back, to protect yourself. Yet here's what's strange: despite living in an era where trust seems to be collapsing-where only 36% of Americans say they trust their fellow citizens-we still extend trust to strangers every single day. We hand our credit cards to waiters, share our deepest fears with therapists we've just met, and click "I agree" on terms we haven't read. This paradox lies at the heart of a fascinating truth: we're hardwired to trust, even when logic suggests we shouldn't. Research reveals something counterintuitive about how we approach new relationships. We don't start at zero and slowly build confidence. Instead, we begin with surprisingly high trust levels-often at the midpoint or above on trust scales. This isn't naivety; it's evolutionary wisdom. Three forces drive this tendency: the systems around us (laws, incentives, social norms) that make betrayal costly; our personality traits that predispose many of us toward optimism; and our lightning-fast assessments of others based on competence, integrity, fairness, and loyalty. These snap judgments happen before we have real evidence, relying on shortcuts like group membership, reputation, and even facial features. A person with a "trustworthy face" often receives more trust-and then, remarkably, lives up to it. When people feel trusted, they frequently rise to meet those expectations rather than exploit them. This baseline trust greases the wheels of society. Without it, every handshake would require a background check, every transaction a legal team. Countries with higher trust levels consistently outperform low-trust societies economically, precisely because trust reduces friction and enables cooperation. But when that trust shatters, we're remarkably bad at putting the pieces back together.