The 4/2 method used in hospitals and developed by the Ritz hotel leads to greater general satisfaction and a heightened sense of collective well-being. This is called emotional contagion. In a place where we fulfill a common mission, such as a company, it is beneficial to make eye contact and smile at a person if they pass 4 meters from you, and to say hello if they are less than 2 meters.
Source : Positive intelligence, HBR, 2012
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