The document summarizes key aspects of the tertiary sector including services, location factors, outsourcing, transport services and systems, trade, and tourism. It notes that the tertiary sector provides services to satisfy wants and needs. Developed countries have high tertiary sectors due to income levels, fewer agricultural/industrial jobs, and government social services. Outsourcing transfers some services like call centers to less developed countries with lower costs. Transport is crucial and includes infrastructure and vehicles moving people and goods. Trade involves domestic and foreign exchange of goods and services, while tourism has grown into a mass phenomenon due to higher incomes, transportation, leisure time, and promotions.