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- ...includes land that is considered to be a separate factor of production<ref>El Serafy, S. (1991). The environment as capital. R. Costanza. Ecological econ5 KB (716 words) - 12:02, 30 August 2017
- ...owth of temporary, cyclical and recurring migrations; cheap and easy tray- el; constant communication through new information technologies: all question5 KB (802 words) - 20:19, 29 August 2017