subsistence, the production of food and water for survival; economic activities, the production of services and goods to earn money; public activities such as transport, sewage treatment etc ; and social activities, such as recreation.
subsistence, the production of food and water for survival;
economic activities, the production of services and goods to earn money;
public activities such as transport, sewage treatment etc ; and social activities, such as recreation.
Black box analogy of the human component of the system
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