How can we truly claim that the impact of local events boils down to a simple question of atmosphere or availability, as if one could choose to enjoy or avoid them without deeper consequences on the entire trip? This simplistic view misses the glaring asymmetry of costs. When Rock in Rio inflates prices in Lisbon, it’s not just a choice for tourists; it’s a massive economic distortion affecting every aspect of the stay, including public transport prices or even supermarkets. Focusing only on the atmosphere or accommodation does not allow reaching the peak of optimization for a trip, because it ignores hidden costs and the impact on the cost of living for everyone.