Definition
Trust is the shared expectation that other parties — strangers, institutions, future selves — will honour their commitments. In Harari's economic anthropology, trust is the substrate that makes money, credit, contracts, and large-scale cooperation possible. Without it, none of the financial instruments of modernity could function for a single business day.
Money itself, Harari argues, is the most universal and durable system of mutual trust ever devised. A banknote is a worthless piece of paper; it acquires value only because everyone who handles it trusts that everyone else will continue to accept it. Strip away the trust and only the paper remains.
Why it matters
How it works
Trust is built slowly and lost quickly. It accumulates through repeated successful interactions — debts repaid, contracts honoured, courts that adjudicate fairly, currencies that hold their value — and erodes when any of those mechanisms visibly fail. Institutions are essentially crystallised trust: their existence economises on the cognitive cost of evaluating every counterparty from scratch.
When trust is high, transactions are cheap: a handshake closes a deal, a card payment settles in milliseconds, a stranger across the world accepts a transfer without verifying the sender. When trust is low, the same transactions require armies of lawyers, escrow agents, collateral, and verification — and many simply do not happen at all. Modernity's productivity is in large part the dividend of an unusually trusting set of institutions.