Common carrier

Common carrier is a legal and regulatory classification that obligates the operator of an infrastructural network — telephone, railway, pipeline, or internet — to provide service to all customers on nondiscriminatory terms. The common carrier obligation prevents the network operator from denying service based on the content, source, or destination of the traffic it carries, and from charging differential rates for equivalent service.

The doctrine derives from English common law governing turnpikes and ferries, but its modern significance lies in telecommunications. In the United States, the AT\u0026T Bell System accepted common carrier obligations as the regulatory price of its legal monopoly: it could not refuse to connect a call, prioritize one customer's traffic over another's, or use its control of the network to discriminate against competing services.

The erosion of common carrier status in digital infrastructure — particularly the FCC's 2017 reclassification of broadband under the Telecommunications Act of 1996 — removed these nondiscrimination obligations from internet service providers. Without common carrier obligations, ISPs can throttle competitors, create paid prioritization tiers, and extract rent from both content providers and consumers. The debate over Network Neutrality is, at its core, a debate about whether digital infrastructure should be regulated as a common carrier or as a discretionary service.

The common carrier doctrine is not a market intervention. It is a recognition that infrastructure is not optional — and that whoever controls it cannot be permitted to use that control as a lever of exclusion. The absence of common carrier obligations in broadband is not deregulation. It is the privatization of gatekeeping power.