Gabriel Jover Avellà is doctor in early modern economic history (University of Barcelona, 1997) and professor of economic history at the University of Girona. He teaches courses on economic and environmental history. His research is focused on agrarian and environmental history from the 17th to the 19th centuries. He uses official statistics and private accounts written by farms or big estates in the Majorca Island to analyze the changes experienced in labour demand and supply related with land-use and agricultural changes in Mediterranean organic agro-systems. His aim is to reconstruct a long-term historical comparative analysis between agrarian societies where large estates which hired wage labourers were predominant, like in the island of Majorca, and others where family farms were dominant, like Catalonia.