This paper measures two descriptors of tourism namely, its scale and agglomeration level and subsequently evaluates both descriptors according to their direct and joint impacts on the host communities' quality of life. The key constructs for this research are This paper measures two descriptors of tourism namely, its scale and agglomeration level and subsequently evaluates both descriptors according to their direct and joint impacts on the host communities' quality of life. The key constructs for this research are the following: (1) a tourism evaluation function that incorporates the scale and agglomeration of tourism, which is constructed for each one of the 50 Spanish provinces; and (2) a measure of the host communities' quality of life that comprises 12 objective
partial indicators and an overall indicator that integrates them all. Results show the existence of carrying capacity frontiers or
maximum thresholds that tourist destinations can sustain without damaging the economic, socio cultural, or environmental systems
of the communities they belong.[+][-]