Trust (Economics)

Trust, in economics, is the willingness of one party to rely on another to keep a promise or act fairly when the first party cannot fully monitor or enforce that behaviour. Almost every economic exchange involves some delay or uncertainty between one side's action and the other's: goods shipped before payment, wages paid before work is finished, deposits made in the expectation that they can be withdrawn. Trust fills that gap. Economists study it as part of social capital, the shared norms and networks that let people cooperate.

The idea links several fields. In behavioral economics and game theory, trust is measured in laboratory games. In development and growth economics, survey measures of trust are compared across countries. In finance, trust underpins money, banking and markets. The term is separate from the legal "trust", an arrangement in which a trustee holds assets for beneficiaries, and from the historical business "trusts" that gave rise to antitrust law and the Sherman Act.

Think of an honesty box at a farm gate. The farmer leaves eggs out with a jar for money and walks away. If most passers-by pay, the farmer saves the cost of standing there all day, and buyers get fresh eggs cheaply. If too many take eggs without paying, the farmer gives up and the convenient arrangement disappears for everyone.

Whole economies work a little like that. Where people expect others to keep their word, they can trade quickly with strangers and skip expensive checks. Where they do not, every deal needs guards, lawyers and paperwork, and many useful deals never happen.

The economist Kenneth Arrow observed in 1972 that virtually every commercial transaction contains an element of trust, and suggested that much economic backwardness could be explained by a lack of mutual confidence. The underlying problem is asymmetric information: one side usually knows more about its own reliability than the other. Without trust, buyers may assume the worst, as in the market for lemons, and good-quality sellers withdraw. Agents may exploit those who hire them, the principal-agent problem, and protected parties may take more risk, a form of moral hazard.

Trust reduces these frictions by letting people skip some monitoring and contracting. Francis Fukuyama's 1995 book on trust argued that societies with high trust beyond the family find it easier to build large firms. Cross-country studies, such as work by Stephen Knack and Philip Keefer in 1997, found that higher survey trust was associated with faster growth, although the direction of cause and effect is hard to prove, since prosperity and good institutions may themselves build trust.

The most widely used survey measure, asked in the World Values Survey and similar polls, is whether respondents think most people can be trusted or that one needs to be very careful. Nordic countries consistently report the highest shares agreeing that most people can be trusted, while many countries in Latin America, Africa and parts of Asia report low shares. Critics note that answers depend on how people interpret the question.

Experiments offer a behavioural measure. In the trust game introduced by Joyce Berg, John Dickhaut and Kevin McCabe in 1995, a sender with an endowment $E$ passes an amount $x$ to a receiver; the amount is tripled, and the receiver chooses how much, $y$, to return. The payoffs are:

With $E = 10$, a sender who passes 5 gives the receiver 15. If the receiver returns 7, the sender ends with $10 - 5 + 7 = 12$ and the receiver with $15 - 7 = 8$, so both are better off than if nothing had been sent. A strictly self-interested receiver would return nothing, so the Nash equilibrium for selfish players is to send nothing. In practice most senders pass a substantial share and many receivers reciprocate, evidence that trust and fairness norms shape real behaviour.

Modern money is a system of trust. A fiat currency has value because people expect others to accept it and expect the central bank to protect its purchasing power; when that confidence collapses, hyperinflation and flight into foreign currency or gold follow. Banking depends on depositors trusting that they can withdraw; a loss of that trust can cause a bank run, which is why governments provide deposit insurance and lender-of-last-resort support.

Many institutions exist to substitute for, or support, personal trust:

• Law and property rights. Courts and enforceable contracts allow strangers to deal with each other.
• Information intermediaries. A credit bureau, ratings agencies and online review systems let reputations travel.
• Payment safeguards. Escrow and card chargebacks protect one side until the other performs.
• Networks of personal trust. Informal systems such as hawala rely on family, ethnic or community ties and reputation rather than formal enforcement.

Blockchain designers describe their networks as a trustless system, meaning users rely on cryptography and open rules rather than on any single intermediary. Critics point out that users still have to trust software developers, exchanges and the issuers of stablecoins.

Trust can be misplaced. High-trust environments are exploited by fraudsters, from affinity frauds within religious or ethnic communities to Ponzi schemes that rely on personal relationships. Strong trust within closed groups can also exclude outsiders, limiting competition. Some economists caution that trust is hard to define and measure, and that what looks like trust may simply be confidence in well-enforced rules. Still, most agree that a reliable legal system and honest public institutions help sustain the everyday trust that markets need.

• World Values Survey
• Organisation for Economic Co-operation and Development (OECD)