Seen in the light of social identity theory, then, the boys in the experiment do have a reason to be selfish about the allocation of the virtual cash.

那么，根据社会认同理论，实验中的那些男孩确实有理由在分配虚拟货币的时候变得自私。

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Lucky for them, all they have to do is sign up a few friends for a fresh hit of virtual cash.

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MTGox, on which most bitcoin trading takes place, was overwhelmed earlier this week by the amount of people who joined the exchange to trade the virtual cash.

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Tuesday's case doesn't involve bitcoin, though the virtual-cash community was watching developments closely.

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