Trust a little more than your gut says

How to do it

Pick something small you can afford to lose. A tool, a book, a favour you'd normally not ask for.
Notice the read before you decide: "they won't bring it back", "they won't bother".
Check it against the number. Students guessed half would repay; 80% did.
Keep the stakes small, then go ahead. Lend it, or ask.

Why the low read sticks

Your readexpects the worst
In a money game, students guessed about half of the strangers they saw would repay their trust. 80% did.
Strangersdo better than that
Across 40 countries, "lost" wallets handed to staff were reported to the owner more often with cash inside than without.
No trustmeans no correction
If you never trust someone, you never learn they'd have repaid you. In the lab, only seeing what everyone did, trusted or not, fixed the guess.
Youtrust a notch more
You can't see what everyone did, but the studies can. Leaning on their numbers is the nearest real-life version. Untested as a fix.

Why it works

Most men carry a quiet estimate of other people. They won't help, won't give it back, are out for themselves. The estimate tends to run low. In a money game, 120 students guessed that about half of the strangers they saw on video would repay their trust; 80% did. Evidence: decent In more than 17,000 "lost" wallets handed in across 355 cities and 40 countries, the ones with cash inside were reported to the owner more often, not less, in 38 of the 40 countries. Evidence: decent

The trouble with a low read is that it rarely gets tested. If you never lend the ladder, you never find out it would have come back. That's the argument of the trust study, and in the lab it held: people who saw how everyone behaved, trusted or not, stopped underrating them, while people who only heard back when they'd trusted stayed low. Evidence: decent Your own life works like the second group: you only hear back from the people you trusted. So one small test won't fix the read. Evidence: decent What you can do is lean on the numbers the studies give you, and trust a little more than your gut says on small things. That step is mine, and untested. Evidence: worth trying

The long readEvery step of the chain, each study with its numbers, and what's still unproven. 3 min read.

What happens in your brain

This chain is behaviour, not brain areas. The first three stops come from two separate studies. The last is my reasoning.

Your read expects the worst. Students guessed about half of strangers would repay their trust in a money game; 80% did. Evidence: decent

Strangers do better than that. In the wallet study, reports to the owner went from 40% without cash to 51% with it. Evidence: decent

No trust means no correction. A trust you never extend can't prove you wrong. In the lab, only feedback on everyone, trusted or not, corrected the low guess. Evidence: decent

You trust a notch more. Leaning on the numbers instead of your gut hasn't been tested as a fix. Evidence: worth trying

The proof

Cohn, Maréchal, Tannenbaum and Zünd, 2019: 17,303 wallets handed to staff at banks, hotels, post offices and the like, in 355 cities across 40 countries. With cash inside, 51% were reported to the owner; without, 40%. Where they tried a bigger sum, in the US, UK and Poland, it reached 72%. Evidence: decent
Fetchenhauer and Dunning, 2010: 120 German students guessed that 52% of 56 strangers on video would repay trust in a money game; 80% did. Seeing what every stranger did fixed the guess; hearing back only after trusting didn't. Evidence: decent
Stavrova and Ehlebracht, 2016: in two US panels and one German one, more cynical people's income grew less over the next 2 to 9 years. In the German panel, the least cynical people's monthly pay rose about €240 over nine years; the most cynical saw no clear rise. Evidence: decent The panels measured cynicism at one point and income later. They show who fell behind, not that the cynicism caused it. Evidence: decent

How to do it

Pick something small you can afford to lose: a tool, a book, a favour you'd normally not ask for.
Notice the read before you decide: "they won't bring it back", "they won't bother".
Check it against the number: students guessed half would repay, and 80% did.
Keep the stakes small, then go ahead. Lend it, or ask.

Watch out

You'll read that cynicism costs you money and health. That's oversold. The income part comes from lagged panels, not experiments: cynical people's income grew less, and something else about them could explain it; the authors say the reverse, hard times breeding cynicism, is plausible too. Evidence: decent Health isn't covered by the studies on this page, so I won't repeat that half.

The wallet study measured whether staff emailed the owner of a wallet handed over a counter, not how your neighbour treats a lent ladder. Evidence: decent In the trust study, hearing back only from people you trusted didn't correct the low guess. Evidence: decent So one trust of your own won't correct your read. Evidence: decent Trusting more because of the numbers hasn't been tested. Evidence: worth trying

Keep the stakes small. This is a test of your read, not a rule to trust everyone. Someone who has let you down before has given you evidence too.

What you get

In a money game, students guessed half of strangers would repay their trust. 80% did.

The proof

80%vs 52%Strangers who repaid trust in a money game, against what 120 students guessed beforehand. Evidence: decent
17,303wallets355 cities, 40 countries. Reported to the owner 51% of the time with cash inside, 40% without. Evidence: decent
3national panelsTwo US, one German. More cynical people's income grew less over 2 to 9 years. A link, not an experiment. Evidence: decent

Watch out

You'll read that cynicism costs you money and health. The income part comes from panels that measured cynicism once and income later. That shows who fell behind, not that the cynicism did it; the authors say the reverse is plausible too. Health isn't covered by the studies on this page. The wallets were handed to staff at a counter, and the measure was an email to the owner, not how your neighbour treats a lent ladder. In the trust study, hearing back only from people you trusted didn't fix the low guess; seeing how everyone behaved did. One trust of your own won't correct your read, which is why this leans on the numbers, not on a test. Trusting more because of them is untested. Keep the stakes small. This is about small things, not a rule to trust everyone. Someone who has let you down before has given you evidence too.