نبذة مختصرة : Grounded on empirical investigations in two ordinary cities of emerging countries – Vitória in Brazil and Coimbatore in India – we argue that solid waste management in Southern cities cannot be conceived excluding the so-called “informal” actors at the risk of fiasco. Such an assessment is nowadays broadly acknowledged, yet its reasons are not always made explicit. We start from the empirical observation of appropriation conflicts, which arise with the introduction of municipal selective collection schemes and which transcend the “Big private operator versus small wastepickers” dichotomy. These clashes lead us to formulate the following central question: to whom do solid wastes –this res derelictae- belong to, taking into account that their very definition lies in abandonment. That is what our research aims at: confronting economic theory to an urban planning approach we show that the urban solid waste deposit corresponds to an impure public good (or evil!), a blurred object characterized by rivalry and non-exclusion. This is particularly due to transhipments in the evacuation service, as well as to the commodity value of a growing number of items – on condition that they should be recovered at source. Finally, taking a zoom-out in order to apprehend this issue through a global lens, we argue that the local dry waste sales business is directly determined by raw material prices fluctuations. The global economy impact on a local urban service leads us to acknowledge urban mining strategies which renew the appropriations' legitimacy question ; Sur la base d'investigations empiriques dans deux villes ordinaires de pays émergents –Vitória au Brésil et Coimbatore en Inde- nous expliquons pourquoi la gestion des déchets municipaux au Sud ne peut pas exclure les acteurs dits « informels » sous peine d'aboutir à des fiascos. Ce constat est désormais unanimement reconnu, sans qu'en soient pour autant explicitées les raisons. Nous partons de l'observation empirique de conflits d'appropriation, qui apparaissent lors de ...
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