The document discusses the tertiary sector of the economy. The tertiary sector consists of activities that provide services to consumers and businesses. It is divided into different areas like health, education, public safety, administration, cultural professions, and the judicial system. Within the tertiary sector, there are also several types of transport like air, water, rail, and road transport. Various types of retail businesses that sell goods to consumers are also part of the tertiary sector, including hypermarkets, supermarkets, department stores, and specialty shops. The tertiary sector is particularly important in Spain, where more people work in services than in the primary and secondary sectors combined.