The nature of equity: principle or pragmatism?
Scholarship divides sharply on equity's normative foundations. Principle-based accounts (e.g. Finn, Fiduciary Obligations; Mason, 'The Place of Equity and Equitable Remedies in the Contemporary Common Law World' (1994) 110 LQR 238) argue that equity embodies substantive moral values—conscience, loyalty, fidelity—distinct from common law corrective and distributive justice. Equity, on this view, is a normatively coherent system.
Sceptical accounts (e.g. Birks, Unjust Enrichment (2nd edn, 2005); Edelman, 'The Role of Status in the Law of Obligations' in Philosophical Foundations of Fiduciary Law (2014)) maintain that equity is best understood as a historical category, now fragmented across property, obligations, and remedies. Talk of conscience is rhetoric masking legal rules. Equity's unity is illusory.
Intermediate positions acknowledge equity's historical and conceptual distinctiveness while accepting that many equitable doctrines can be rationalised in non-moral terms (e.g. efficiency, default rules, information asymmetries).
Trusts as contracts?
Langbein ('The Contractarian Basis of the Law of Trusts' (1995) 105 Yale LJ 625) argues that trust law is best understood as a set of default rules designed to fill gaps in settlor intention, analogous to contract law. Trustees and beneficiaries are in a relationship governed primarily by the settlor's directions, enforced by the court much like contractual obligations.
Critics (e.g. Penner, The Law of Trusts (11th edn, 2019)) object that trusts lack essential contractual features (consideration, privity, bilateral consent) and that the beneficiary's rights are proprietary, not merely personal. Langbein's thesis may better fit commercial trusts (e.g. pension funds, securitisations) than traditional family settlements.
Equity as corrective justice or distributive justice?
Smith ('Transfers' in P Birks & A Pretto (eds), Breach of Trust (2002)) argues that equity, particularly in the law of trusts, is concerned with distributive justice: allocating entitlements to property. By contrast, common law obligations (tort, contract) vindicate corrective justice.
Others contend that equity's remedies, particularly account of profits and equitable compensation, are better explained as corrective justice responses to wrongdoing (Edelman, Gain-Based Damages (2002)).
Proprietary restitution and tracing
The role of property in unjust enrichment is controversial. Birks and Chambers argue that unjust enrichment can give rise to proprietary as well as personal remedies. Swadling and others reject proprietary restitution, maintaining that property rights arise only where recognised by law, not as a remedy for unjust enrichment.
Tracing—following trust property through substitutions—raises difficult conceptual questions. Is it a process (Foskett v McKeown [2001] 1 AC 102, per Lord Millett) or a remedy? Can it be explained in terms of causation or is it a distinctive equitable doctrine?
The trust and insolvency
The proprietary nature of the beneficiary's interest insulates trust assets from the trustee's insolvency. This is uncontroversial in traditional express trusts. But in borderline cases—Quistclose trusts (Barclays Bank Ltd v Quistclose Investments Ltd [1970] AC 567), retention of title clauses, charge-backs—the classification can be outcome-determinative and is often contested.
Some scholars (e.g. Worthington) argue that trust analysis is manipulated to achieve insolvency outcomes; others maintain that principled doctrinal analysis determines the results.
Comparative perspectives: civilian systems and the trust
Civil law jurisdictions traditionally lack the trust institution, because their property systems do not accommodate divided ownership. The Hague Convention on Trusts (1985) facilitates cross-border recognition, but civilian lawyers often struggle to conceptualise the trust within their doctrinal frameworks.
Civilian substitutes (fiducie in France, Treuhand in Germany) differ significantly from the common law trust. Comparative scholarship illuminates the trust's distinctive features and suggests that common law equity is not easily exportable.
Equity and legal pluralism
Some theorists situate equity within debates about legal pluralism. Equity, on this view, represents a normative order that coexists with, but is not reducible to, common law. This perspective resonates with historical accounts (e.g. Baker, An Introduction to English Legal History) and with theories of institutional interaction (e.g. Cover, 'Nomos and Narrative').
Feminist and critical perspectives
Feminist scholars have critiqued equity's invocation of 'conscience' as gendered and paternalistic, particularly in family property disputes. Critical scholars note that equity historically reinforced class and status hierarchies (e.g. marriage settlements, primogeniture). Recent scholarship explores equity's potential as a site for progressive legal development, particularly in proprietary estoppel and unconscionability doctrines.