... margins to the effect that including one child while excluding another makes little cost difference to the provider. Yet, in the final instance, the most important factor of all in bringing about ... questionable, therefore, whether the households that did engage in improvements would be able to internalise the gains, since the environment remained polluted. The largest share of the [project] ... The tenants of rented dwellings (both in formal and informal settlements), on the other hand, naturally declined to invest in their landlord’s house, while landlords were not targeted by the...