. A friend of yours, who is moving, asks you to bring over a few boxes. Since you are there anyway, she asks you to fill them with shoes. Before you know it, you have packed up her entire living room,...

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A friend of yours, who is moving, asks you to bring over a few boxes. Since you are there anyway, she asks you to fill them with shoes. Before you know it, you have packed up her entire living room, kitchen, and bedroom. What social psychological process is at work here?