A 信任 B,是 A 相信:在自己无法监督时,B 仍会按 A 的利益行事。这是一个信念,会随证据更新。没有记录时,信念来自先验:制度的保障、品牌与他人的口碑。此后每一次履约都是一条证据;证据改变信念的幅度,取决于它的诊断力,即它在可靠与不可靠的受托人身上出现的概率相差多少。金融场景的困难在于,最常被拿来判断的证据,短期收益,诊断力几乎为零;真正有诊断力的,是过程记录与严重的失误,这也解释了信任为什么建立得慢、失去得快。信念之外,信任还是一个决定:赌注越大,所需的信念越高。好的信任,是与对方实际可信程度相符的信任。
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