In her book, 'The Defiant Optimist', Durreen Shahnaz, the first Bangladeshi woman to work on Wall Street, presents a glimpse of her life and her effort to make financial markets more equitable and inclusive. The founder of the Impact Investment Exchange in Singapore believes that financial systems that enrich the few can be transformed for the good of the many. As India is working on its own social stock exchange, she speaks with Divya Shekhar about what it takes to build an ecosystem to measure and prioritize social impact, whether India is ready to launch a social stock exchange, and why the rules for women to succeed are different—and often harder—than men.