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First Author:
 
Denis Claude
CNRS & CES
denis_claude_economics@yahoo.fr
 
Maison des Sciences Economiques, 106-112 Boulevard de l''Hôpital
Paris Cedex 13, 75647, France
 
 
 

Second Author:

Mabel Tidball
INRA & Lameta
tidball@supagro.inra.fr
 
2 place Viala
Montpellier Cedex 1, 34060, France