This book will introduce a definition of the theory of Gender Economics to create a development pathway for the future study of Gender Economics as a concept. The definition covers Gender Economic sand its application in business at a micro level, as well as in policy and economic theory at a macro level also introduces diversity Economics, a concept that looks at leveraging innovation and performance from diversity. This book firstly defines four major categories of economic activity where this author believes that gender, and particularly women, plays a role, i.e. Investment, Policy, Environment, Innovation and Health. Secondly this chapter details examples from three of the category definitions of Gender Economics.The economic impact of gendered policy formation and History of gendered policy formation - understanding how government policy has been formed and its links to economic modeling,and The cost of conflict and inequity to business - Diversity Economics at an organizational level, Economic modeling theories and gendered assumptions - What do economists have to say about gender and Activism -how is the rise of activism, including feminism,anti feminist movement in global.