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… Newtonian mechanics in formulating their approach to the economy but it is only through the mathematical models of the … conditions of equilibrium.” 15 This representation of the economy seems particularly well adapted to a reflection on … main propositions (Adapted from Steppacher, 1983) 1. Economy is an open system: economic activities are in …

… watercourse; 5. Conservation, protection, development and economy of use of the water resources of the watercourse and …

… such as water, to include factors relating to the economy, tourism, farming and other activities. It has held …