Book excerpt: An interdisciplinary anthology exploring alternatives to the principles of commercial markets that dominate contemporary life. The essays in this volume apply an experimental ethos to collaborative cultural production. Expanding the fields of art, design, and architectural research, contributors provide critical reflection on collaborative practice-based research. The volume builds on a pop-up market hosted by the London-based arts cluster Critical Practice that sought to creatively explore existing structures of evaluation and actively produce new ones. Assembled by lead editor Marsha Bradfield, the essays contextualize the event within London's long history of marketplaces, offer reflections from the stallholders, and celebrate its value system, particularly its critique of econometrics. A glossary rounds off the text and opens up the publication as a resource.