So currency works as a constant, if latent, reminder of identity. In using it, one has the psychological experience of participating with others in a common venture, and thus developing a sense of trust in both the endeavor and one’s fellow-participants.
但国家货币——我们每次支付现金时都会展示一下——则没有引起这样的怀疑。因此，货币可以作为恒久的（潜在）身份提醒器。使用货币时，我们就有了与其他人共荣辱的潜在心理体验，从而发展出一种对方会尽心尽力与你并肩作战的信任感。