The metal economy is huge. Almost every product requires metal. But metallurgists don't take home a big fraction of it. What's special about the software economy is that people who write the software take home a large fraction of it. Maybe more than half, depending how you count. Which is unprecedented. It's not just because software can be zero marginal cost. Musicians don't take home half of music revenue. In most…
There's SIC / NAICS / ISIC codes, or tier classifications, ranging from three (Qesnay) to five (Clark (1940), Hatt and Foote (1953), and Bell (1973)):
[A]n economy's major sectors, as delineated by Clark (1940), Hatt and Foote (1953), and Bell (1973), correspond to major stages in the essential life process. The primary sector -- agriculture, fishing, lumber, mining, oil and gas -- represents the extraction of matter from the environment to produce energy, including the calories to sustain individual organisms. The secondary sector -- processing primary goods, as in construction and manufacturing -- represents the synthesis of matter and energy into more organized forms (negentropy). The tertiary sector, including transportation and utilities, represents the infrastructure for distributing matter and energy about the system, while the quaternary sector -- trade, finance, insurance, and real estate -- constitutes a parallel infrastructure for the collection, processing, and distribution of information that is necessary in all living system for the control of material flows. Finally, the "highest" of all sectors in its remove from the physical environment is the quinary sector, including government, law, and education, representing the societal programming -- socialization, education, law making -- and collective or representative decision making to effect control.
-- James Beniger, *The Control Revolution,8 p. 179.
For participants, perhaps: unskilled labour, skilled labour, professionals, managers, finance, consumers?