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1988
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Economies d'énergies. : Factor four : doubling wealth, halving resource use : the new report to the Club of Rome / Ernst von Weizacker, Amory B Lovins, and L Hunter Lovins
1997
1
Economies externes -- Congres. : Social costs and public action in modern capitalism : essays inspired by Karl William Kapp's theory of social costs / edited by Wolfram Elsner, Pietro Frigato and Paolo Ramazzotti
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A practice whereby tokens representing money, toys, candy, etc., are given as secondary reinforcers contingent upon certain desired behaviors or performances