Restraint of trade is a common law principle that governs the enforceability of contractual limitations on commercial activity, serving as a precursor to modern competition law. Historically, it has sought to balance personal freedom with public interest, as illustrated in cases such as Mitchel v Reynolds (1711), which stressed that limitations must be reasonable to safeguard valid interests. Thinkers like John Taylor of Caroline criticized trade barriers for hindering commerce, while H.G.
Wells associated tariffs with broader economic decline. Modern discussions, such as Robert H. Jackson’s dissent in Timken Roller Bearing Company v. United States, underscore the conflict between restrictions on foreign markets and the principle of free trade. Although contemporary competition laws have limited its application, the doctrine’s influence remains in antitrust systems, illustrating a continuing struggle between contractual autonomy and economic equity.