This document discusses the role of infrastructure, including economic and social infrastructure, in economic development. It defines economic infrastructure as facilities like transportation, energy and communications that support industry, and social infrastructure as facilities like education, health and housing that support human development. The document explains that well-developed infrastructure boosts economic growth by expanding industry's productive capacity and stimulating aggregate demand. It also discusses how social infrastructure like education and health are important for labor productivity and economic growth, but may require government support and investment. The conclusion states that infrastructure development can be an effective way to reduce poverty by improving access to opportunities.