The strongest trust in any market has never come from what someone says. It comes from what they're willing to risk alongside you.

Warren Buffett has run one of the most closely watched investment firms in the world for decades, and one detail explains more about why people trust him than any letter he's ever written: the overwhelming majority of his own personal wealth sits in the same company his shareholders have invested in. When the firm does well, his own fortune rises with it. When it does poorly, his own fortune falls exactly as much as anyone else holding the same shares.

This is an old idea with a modern name: having skin in the game. A simple, demanding standard — a person's confidence should be trusted in direct proportion to what they themselves stand to lose if they're wrong.

Words are cheap. Anyone can say they're confident in an idea. What can't be faked, at least not for long, is a person putting their own money where their words are, accepting the same downside they're asking someone else to accept.

This isn't a small detail of financial ethics — it's the actual mechanism that makes trust between strangers possible at any scale. A trader who follows a tip has no way to check the tipster's honesty directly. What they can check is whether the person offering the tip has their own money in the same position, under the same terms.

There's a well-known version of this with company insiders. When an executive buys more shares of their own company with their own money, it carries far more weight than any public statement of confidence — because the money is real, and the statement is free.

The same logic runs the other way too, and it matters just as much. Someone who gives advice, takes a fee, and bears none of the downside if it fails has structurally weaker incentives to be careful — no matter how good their intentions actually are. That's not an accusation. It's just what incentives do to behaviour, reliably.

Trust built on words alone is fragile, because words cost nothing to produce. Trust built on shared risk is durable, because it can't be faked. Buffett's own fortune, tied permanently to the fortunes of the people who trust him, has never needed a single sentence of reassurance to make its point.