According to Hoover et al.(1983),pedestrians who are more likely to help another pedestrian pick up a dropped envelope are those who:

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Hoover et al. (1983) found that pedestrians who had just had their photograph taken were more likely to help another pedestrian pick up a dropped envelope. This is thought to be due to the increased self-awareness and positive mood induced by having one's photograph taken, which in turn increases prosocial behavior.

According to Hoover Et Al