See Resnick and Wolff's Economics: Marxian versus Neoclassical, Johns Hopkins University Press, 1987:
1. Cultural processes are all those in which people construct meanings for themselves --- for example, language, arts and letters, music, religion, science, and so on.
2. Economic processes are all those in which goods and services are produced, appropriated, distributed and/or circulated within society among producers and consumers.
3. Environmental (or natural) processes are those involving the transformation (biological, chemical, etc.) of physical properties of matter.
4. Political processes are those concerned with the control (legislative, judicial, administrative, etc.) of individual and group behavior within society.
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