This outcome gives a first suggestion on the possible source of negative externality when total crime is analysed: the impact of a rise in residents and visitors on crime is quite similar, which may indicate that the main forces driving tourism-crime relationship are the agglomeration and urbanisation effects. Overcrowded cities give more opportunities to criminals to commit illegal activities, regardless of the share of visitors and residents in the tourism destinations. Probably, as the empirical studies suggest, the presence of visitors provides an incentive for certain illegal activities; therefore, it is a possible substitution among crime types that should be further explored.
4 Concluding