People would be less likely to help a man who fainted in a busy shopping mall, but more likely to help a man who fainted small convenience store. This behavior explains

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The bystander effect describes a phenomenon where people are less likely to offer help to a victim when other people are present. The more bystanders there are, the less likely any one individual is to help, often due to a diffusion of responsibility. In a busy shopping mall, with many people around, individuals might assume someone else will intervene, whereas in a small convenience store, with fewer people present, an individual may feel more directly responsible to act.

People Would Be Less Likely to Help a Man Who