This economics essay analyzes the Greater Sydney Region Plan, focusing on the transformation of Sydney into a "metropolis of three cities." The essay addresses the plan's objectives related to infrastructure development, trading city strategies, and the concept of factory cities (Harbour CBD, Greater Parramatta, and Western Sydney). It explores how Sydney is developing an innovation city, emphasizing the integration of education, health, and technology. The analysis delves into how the plan aims to improve liveability, productivity, and sustainability to meet the needs of a growing population. The essay examines specific objectives within the plan, such as the development of trading cities through infrastructure investment and the creation of innovation hubs. It also discusses the characteristics that define factory cities and how these areas contribute to Sydney's economic growth. The essay concludes by summarizing the plan's goals for fostering a more sustainable and connected urban environment.