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Forest stands are thinned all over the world. Yet, there was hitherto no consistent theory which allowed deriving unambiguous conditions for thinnings as the harvest of trees prior to the rotation age. Renke Coordes closes this gap by proposing a new, more general view on the Faustmann model as the basic investment model in forest resource economics. With the introduction of mutual interdependencies between the trees growing in a stand and the opportunity to harvest trees prior to the rotation age, optimal thinning regimes can be derived and analyzed. The implications of the proposed model are thoroughly discussed against the background of practical forest management decisions. The author closes with adaptations to the problems of the management of mixed, multiple-use and uneven-aged stands and entire forests. In this way, a unified perspective on the management of forests as natural resources is offered.