Investigating the extent to which the European Union can be defined as a "highly competitive social market economy", this edited collection illustrates and tests the constitutional reverberations of Art. 3(3) of the Treaty on the European Union, and discusses its actual and potential transformative effect. In the aftermath of Brexit, and in the 60th anniversary of the Treaty of Rome, the book is particularly timely and topical, offering new and deeper insights on the complex and constantly evolving social dimension of the EU, ultimately reflecting on how the objective of (re)constituting the EU as a "highly competitive social market economy" might best be achieved.