This book delves into the doctrine of separate spheres within the history of economic thought. The concept of separate spheres emerged in philosophy and has consistently been incorporated by various disciplines. This book stands as the first comprehensive exploration of how this doctrine was embraced, adapted, and contested by economists engaged in gender issues and marriage theory. Spanning the late eighteenth to the early twentieth century, it illuminates the evolution of the drive for gender equality--rooted primarily in the tradition of classical liberalism--across the landscape of economic ideas and theories. This book is a valuable resource for scholars and researchers interested in the intricate history of the interconnections among between economic thought, feminism, gender studies, and cultural studies.