Influence is the ability to shape how other people think, feel, and act — without force or direct authority.
Robert Cialdini’s six principles of influence (from his book Influence) are the foundation:
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Reciprocity — when you give something, people feel compelled to give back. This is hardwired. Buy someone coffee and they’ll help you move apartments.
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Commitment & Consistency — once people commit to something (especially publicly), they’ll act consistently with that commitment. Start with small asks and build up.
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Social Proof — people look to others to determine correct behavior. “5,000 customers can’t be wrong.” Reviews, testimonials, and crowd behavior all leverage this.
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Authority — people defer to experts and authority figures. Credentials, titles, and expertise increase influence. This is why ethos matters.
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Liking — people say yes to people they like. Similarity, compliments, and cooperation increase liking. This isn’t manipulation — genuinely caring about people makes you more influential.
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Scarcity — things become more desirable when they’re rare or disappearing. “Limited time offer” and “only 3 left” work because of loss aversion.
The ethical dimension: these principles work whether used for good or ill. Understanding them makes you both more influential and more resistant to manipulation. When you recognize a scarcity tactic being used on you, it loses its power.
True influence — the lasting kind — comes from consistently being helpful, honest, and competent. Techniques get you short-term compliance. Character gets you long-term influence.
Related: Persuasion, Rhetoric, Good listening