What is the economic argument for public engagement? Around the world, public officials and other leaders have devised new ways to engage citizens in decision-making and problem-solving – but typically they have focused on planning, budgeting, and schools rather than poverty, inequality, or other economic issues. Meanwhile, emerging evidence from Brazil and other parts of the Global South suggests that sustained patterns of engagement builds social capital, which in turn has an impact on a range of indicators, including economic inequality and the distribution of wealth. This article summarizes several disparate areas of research on the connections between engagement and inequality, and suggest new questions and directions for innovation.