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In presidential systems, the executive acts as both head of state and head of government, and has power to appoint an unelected cabinet. Under a presidential system, the executive branch is separate from the legislature to which it is not accountable. Definitions of Law often raise the question of the extent to which law incorporates morality. John Austin’s utilitarian answer was that law is “commands, backed by threat of sanctions, from a sovereign, to whom people have a habit of obedience”. Natural lawyers on the other side, such as Jean-Jacques Rousseau, argue that law reflects essentially moral and unchangeable laws of nature. The concept of “natural law” emerged in ancient Greek philosophy concurrently and in connection with the notion of justice, and re-entered the mainstream of Western culture through the writings of Thomas Aquinas, notably his Treatise on Law.

• The sources for public international law development are custom, practice and treaties between sovereign nations, such as the Geneva Conventions.
• Rational individuals trade through bilateral contracts on open markets until the costs of transactions mean that using corporations to produce things is more cost-effective.
• Law implies imposition by a sovereign authority and the obligation of obedience on the part of all subject to that authority.

Land law forms the basis for most kinds of property law, and is the most complex. It concerns mortgages, rental agreements, licences, covenants, easements and the statutory systems for land registration. Regulations on the use of personal property fall under intellectual property, company law, trusts and commercial law.

In civil law the sources recognised as authoritative are, primarily, legislation—especially codifications in constitutions or statutes passed by government—and custom. Codifications date back millennia, with one early example being the Babylonian Codex Hammurabi. Modern civil law systems essentially derive from legal codes issued by Byzantine Emperor Justinian I in the 6th century, which were rediscovered by 11th century Italy. Roman law in the days of the Roman Republic and Empire was heavily procedural, and lacked a professional legal class. Decisions were not published in any systematic way, so any case law that developed was disguised and almost unrecognised. Each case was to be decided afresh from the laws of the State, which mirrors the unimportance of judges’ decisions for future cases in civil law systems today.

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Bentham and Austin argued for law’s positivism; that real law is entirely separate from “morality”. Kant was also criticised by Friedrich Nietzsche, who rejected the principle of equality, and believed that law emanates from the will to power, and cannot be labeled as “moral” or “immoral”. There have been several attempts to produce “a universally acceptable definition of law”. In 1972, Baron Hampstead suggested that no such definition could be produced. McCoubrey and White said that the question “what is law?” has no simple answer.

Constitutional and administrative law

The UK, Finland and New Zealand assert the ideal of parliamentary sovereignty, whereby the unelected judiciary may not overturn law passed by a democratic legislature. Home to cutting-edge scholars and a rich mix of courses, clinical opportunities and extracurricular engagements, UCLA Law allows students to dive deep on areas ranging from constitutional law to critical race studies, and from corporate law to public interest law and policy. With our international focus and roots going far back in the Dutch legal order, we have trained many generations of legal professionals for key positions in a society governed by the rule of law.

In common law legal systems, decisions by courts are explicitly acknowledged as “law” on equal footing with statutes adopted through the legislative process and with regulations issued by the executive branch. The “doctrine of precedent”, or stare decisis (Latin for “to stand by decisions”) means that decisions by higher courts bind lower courts, and future decisions of the same court, to assure that similar cases reach similar results. Many Muslim countries have developed similar rules about legal education and the legal profession, but some still allow lawyers with training in traditional Islamic law to practice law before personal status law courts. In China and other developing countries there are not sufficient professionally trained people to staff the existing judicial systems, and, accordingly, formal standards are more relaxed.