Finance is regulated because its failures do not stay private. Banks transform short-term deposits into long-term loans, which makes them vulnerable to runs; insurers promise to pay claims years in the future; markets depend on accurate information and fair dealing. When a large or interconnected institution fails, losses spread through funding markets, payment pergalan and confidence, and the costs fall on depositors, policyholders, taxpayers and the wider economy. Economic research on crises has documented these channels repeatedly.
Regulation responds in layers. Prudential rules require capital, liquidity and sound risk management so that individual firms can absorb losses. Conduct rules protect customers and market integrity. Macroprudential policy addresses risks that build across the system, such as credit booms and common exposures. Resolution regimes aim to let failing firms fail without disorder. International standards coordinate these rules across borders, while national authorities apply them.
Each layer has known weaknesses. Rules can be arbitraged by moving activity to less regulated entities or jurisdictions. Complexity can obscure rather than reduce risk. Supervisory data may be late, inconsistent or blind to new exposures. New technologies, from algorithmic trading to digital assets and AI-driven services, test frameworks designed for earlier business models. Climate, cyber and other systemic risks challenge regulators to look beyond the balance sheet. Understanding these tensions is the work of the field.