Prince’s main research interest is in the philosophy of contract law. He has written extensively on philosophical puzzles relating to a variety of doctrines in the field. 

Prince also works on broader questions about transnational private law, the ethics of markets, and the regulation of new technologies. 

He is co-editor of the volume Philosophical Foundations of Contract Law (OUP Oxford hbk 2014 pbk 2016). 

His book Contract Law Without Foundations: Toward a Republican Theory of Contract Law (OUP Oxford 2019) was shortlisted for the Society of Legal Scholars Peter Birks Book Prize for Outstanding Legal Scholarship (2019). It attempts to break new ground in the philosophy of contract law by upending the orthodox picture of the field. The book claims that traditional theories of contract law which argue either that contract law reflects or mirrors the morality of promise, or instead that it pursues its own distinct ends or goals, such as economic efficiency, both seriously mishandle legal doctrine by ignoring or underplaying the irreducible plurality of values that shape contract law. The book defends the role of this multiplicity of values in forging contract doctrine, by developing from the ground-up a radical and distinctly republican re-interpreation of the field.