The field of private law theory is currently experiencing an unexpected revival both in Europe and in the United States.Footnote 1 The quasi-monopoly of the economic analysis of law,Footnote 2 especially in the field of business law, is (again) challenged by diverse approaches inspired by analytical philosophyFootnote 3, social theoryFootnote 4, or political economyFootnote 5.
Yet these different strands of thought appear strangely disconnected in at least three respects. First, they seldom speak to each other. Instead, there is a proliferation of highly specialized publications, conferences and debates within sub-disciplines such as law & economics or law & society.Footnote 6 Second, debates in private law theory seem increasingly detached from discussions of case law and black-letter rules, instead focusing on policy perspectives.Footnote 7 Third, they often lack historical context and fail to engage with the rich tradition of nineteenth and twenthieth century legal thought.Footnote 8
This special issue, which is based on our recently published book on New Private Law Theory: A Pluralist Approach Footnote 9 aims to directly address these shortcomings. Based on canonical texts,Footnote 10 our book aspires to develop a theory of private law that is (1) pluralist with a view to integrating different theoretical and interdisciplinary perspectives, (2) application-oriented with a view to its relevance for concrete legal cases, and (3) historically conscious with a view to its place in the tradition of Western legal thought. In this volume, a group of renowned scholars of private law theory from different countries and diverse intellectual traditions explores and discusses the perspectives of such a theory.
Clearly, the publication of our eponymous book is only a starting point for New Private Law Theory (NPLT). Thus, the contributions to our book launch event in December 2021 that are compiled in this special issue can be considered a snapshot of the discussions the book has inspired – and will hopefully continue to inspire.
The contributions to this special issue all share the main objective of NPLT: To ensure that private law, while “normatively closed,” can be as “cognitively open” as possible.Footnote 11 In order to develop an adequate description of society, private law theory must consider the findings of different disciplines beyond law.Footnote 12 To this end, the introduction to our book formulates the programme of NPLT in five theses.Footnote 13 These five theses are reflected in the contributions to this special issue.
A. Our First Thesis Is That NPLT Is Pluralistic
Mindful of the “polytheism of modernity” (Max Weber) it must look beyond the increasingly mainstream approach of law & economics and open the view to other neighboring disciplines such as sociology, philosophy, and history. The contributions to this volume clearly outline the challenges that this approach is inevitably confronted with. Hanoch Dagan frames the main challenge as a question: If NPLT is to be pluralist, a “mosaic,” then what can hold it together?Footnote 14 Dagan suggests, much in line with our general approach, that the answer to this question can be found in the “normative filter” of private law theory as a theory of justification. Daniel Markovits situates the challenges of a pluralist theory of private law in the intellectual history of the legal discipline. As Markovits demonstrates, the classical legal genre of the casebook offers an important point of reference, but also of differentiation for NPLT’s case-centered, interdisciplinary approach. Yet we are more hopeful than Markovits with regard to the future of law as an academic discipline.Footnote 15 In our optimistic view, the interdisciplinarity that NPLT advocates for will reinforce rather than weaken the necessity of a normative filter that, as Dagan argues, only legal theory can provide.
This normative filter, in the words of Giorgio Resta, entrusts legal reasoning with a “gatekeeping function.”Footnote 16 It implies a necessary scepticism towards the normative claims of any single discipline.Footnote 17 This also holds true for those of the “economic analysis of law.”Footnote 18 At the same time, Resta makes a convincing case for placing greater emphasis on the humanities and not restricting the interdisciplinary dialogue to the social sciences.Footnote 19
B. Our Second Thesis Posits That NPLT Is Comparative
Although the NPLT approach is necessarily rooted in a Northern/Western, (Continental) European, and more specifically German legal tradition, it aims at incorporating perspectives from different legal systems. Guido Alpa’s contribution to this issue specifically demonstrates the richness of Italian private law discourse and its importance for the trajectory of European private law. This holds as true for the sociology of lawFootnote 20 as it does for the discussion around the “constitutionalization”Footnote 21 of private law.Footnote 22
Of course, the Italian perspective still shares many of the normative background assumptions that NPLT rests upon. A much bigger challenge for NPLT will be to engage with perspectives from the Global South, as the contribution of Ralf Michaels makes clear.Footnote 23 Michaels rightly points out the epistemological blind spots of NPLT as a private law theory of Northern origin. At the same time, he seems doubtful whether private law theory as such would survive its own decolonization.Footnote 24 Once again, our position is more optimistic: We think that NPLT can and should inspire criticism and engagement from voices of the Global South. Yet, “like with human rights,”Footnote 25 internal and external critique—as Michaels rightly emphasizes the postcolonial perspective can be both—will ultimately strengthen an emerging global discourse rather than put it to an end.
C. Our Third Thesis Holds That NPLT Is Application Oriented
Much in the spirit of the casebook design of our book, Simon Deakin’s contribution uses a real-world case to illustrate the continuing relevance of private law theories concerned with the “social question.”Footnote 26 The case of P & O Ferries exposes the shortcomings of short-sighted “economic analysis of law” perspectives that disregard both market structures and distributive questions. It is cases like this where NPLT can bring its interdisciplinary approach to full fruition. This is also impressively demonstrated by Chantal Mak’s analysis of the Dutch Shell Nigeria case.Footnote 27 Taking hints from NPLT’s discussion of systems theory and discourse theory,Footnote 28 Mak applies a Habermasian framework in order to illuminate the discourses of justification and application constituting the field of corporate human rights responsibility. At the same time, she uses insights gained from her case analysis for marking the necessary theoretical limitations of a Habermasian approach.
D. Our Fourth Thesis Posits That NPLT Is Neither State Centered nor Exclusively National
As Candida Leone’s contribution to this issue shows the problems contemporary private law is confronted with necessitate an approach that transcends the boundaries of national private laws.Footnote 29 This is especially apparent in the challenges posed by climate change, which are increasingly addressed by litigants in private legal actions. As Leone convincingly argues, these challenges also concern legal education, which should integrate transnational perspectives in its discussion of genuinely transnational problems.
E. Our Fifth Thesis Is That NPLT Reflects Critical Approaches to Private Law
Martijn Hesselink makes clear that this tenet entails both epistemological and normative commitments.Footnote 30 While NPLT might not subscribe to each and every of Hesselink’s normative conclusions, we would strongly agree that a private law theory that takes social complexity seriously must accommodate for pluralism both in an epistemological and in a normative sense. Marisaria Maugeri’s contributionFootnote 31 shows that a critical position in this sense informs NPLT’s reception of intellectual traditions such as Continental European ordoliberalismFootnote 32 and, at the same time, its perspective on contemporary legal problems such as the regulation of digital ledger technologies.
We are deeply impressed by these contributions to our book launch symposium. For us, they demonstrate that NPLT has already become the “starting point for discussions that have yet to take place.”Footnote 33
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