Economic activities are commonly classified into sectors: - Primary Extraction of natural resources (agriculture, mining, fishing, forestry). - Secondary Processing of raw materials and manufacturing (industry, construction). - Tertiary Services that support the primary and secondary sectors and provide services to consumers (trade, transport, communication, banking, healthcare, education). - Quaternary Knowledge-based activities involving the collection, processing, and dissemination of information; research and development; specialized knowledge and technical skills. This sector is focused on the creation, rearrangement, and interpretation of new and existing ideas. - Quinary The highest level of decision-making in an economy, often considered a subset of quaternary activities. These are 'gold collar' professions involving top executives, government officials, scientists, and policy makers who create new knowledge and make significant decisions. The description "creation, rearrangement and interpretation of new and existing ideas" directly corresponds to the definition of quaternary activities.