Deposit insurance began as a controversial promise

Bank deposit insurance can now feel like plumbing: noticed mainly when pressure fails. In the United States, its creation in the Banking Act of 1933 was fiercely contested. Large banks feared subsidising smaller ones, while supporters argued that protected deposits could interrupt the fear that turns withdrawals into a run.

Insurance does not make a banking system riskless, and coverage has limits and jurisdiction-specific rules. Its history matters because the familiar guarantee was a designed response, not a natural property of deposits. A sentence on a bank's door carries an institutional memory of queues, failures and an argument about how public confidence should be built.