In politics, regulatory capture (also agency capture and client politics) is a form of corruption of authority that occurs when a political entity, policymaker, or regulator is co-opted to serve the commercial, ideological, or political interests of a minor constituency, such as a particular geographic area, industry, profession, or ideological group.
When regulatory capture occurs, a special interest is prioritized over the general interests of the public, leading to a net loss for society. The theory of client politics is related to that of rent-seeking and political failure; client politics "occurs when most or all of the benefits of a program go to some single, reasonably small interest (e.g., industry, profession, or locality) but most or all of the costs will be borne by a large number of people (for example, all taxpayers)".
For public choice theorists, regulatory capture occurs because groups or individuals with high-stakes interests in the outcome of policy or regulatory decisions can be expected to focus their resources and energies to gain the policy outcomes they prefer, while members of the public, each with only a tiny individual stake in the outcome, will ignore it altogether. Regulatory capture refers to the actions by interest groups when this is successful at influencing the staff or commission members of the regulator.
Regulatory capture theory is a core focus of the branch of public choice referred to as the economics of regulation; economists in this specialty are critical of conceptualizations of governmental regulatory intervention as being motivated to protect public good. Often cited articles include Bernstein (1955), Huntington (1952), Laffont & Tirole (1991), and Levine & Forrence (1990). The theory of regulatory capture is associated with Nobel laureate economist George Stigler, one of its major developers.
Likelihood of regulatory capture is a risk to which an agency is exposed by its very nature. This suggests that a regulator should be protected from outside influence as much as possible.