The economic activity of a society consists of activities related to the production and consumption of goods and services. Since earliest times, the primary function of organized society has been economic in nature.
The Pentagon is a large office building, with about 6,500,000 sq ft (600,000 m 2), of which 3,700,000 sq ft (340,000 m 2) are used as offices. Approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel work in the Pentagon. It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi (28.2 km) of corridors.
The Pentagonâs first employees moved in on April 30, 1942; the building officially opened on January 14, 1943. Its massive bulkâ6.24 million gross square feetâheld 410,000 cubic yards of concrete, made from some 700,000 tons of sand dredged from the Potomac River.