We show how the exhaustion constraint of non renewable resources, against which maintaining a minimum level of consumption may collapse in the long run, could be relaxed by an appropriate effort in R?D. However along any optimal trajectory of the economy, this effort has to be made if and only...

Usual resource models with capital accumulation focus upon simple one to one process transforming output either into some consumption good or into some capitalgood. We consider a bisectoral model where the capital good, labor and a non renewable resource are used to produce the consumption good...