This is especially true for what Krishna explains as “voluntary” signs, which are not coercive, but instead rely on a person’s choice to take on a behaviour. “The Paris wave is a voluntary sign and it relies on loyalty to the city,” she adds. Non-voluntary signs, on the other hand, tell you exactly what to do. “When we mark a cross on the floor saying this where you should stand, that’s a non-voluntary sign.” She believes a mix of these two types of signs may be an effective solution.



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