The document summarizes key aspects of the tertiary sector of the economy. It discusses how the tertiary sector includes activities that facilitate the flow of goods, people, services, and information. Some key tertiary sector activities discussed include healthcare, education, transportation and communications, commerce, and tourism. Healthcare and education are highlighted as especially important tertiary sectors as they meet basic human needs of health and education. The document provides examples of different modes of transportation and how commerce operates both domestically and internationally. Finally, it outlines different types of tourism activities.