We tend to assume that in interactions with others, their view of the importance of the interaction matches ours. That assumption may be wrong, and can be problematic — “No man is an island, entire of itself,” wrote the poet John Donne, almost exactly four centuries ago. For someone whose day job involves studying and understanding people’s decisions, this is a significant and relevant observation. Humans are a social, cooperative species, and the choices people make, whether in a…