What might lead to a commitment, ? a decision to make a commitment to make the relationship last?

为什么作出承诺，决定承诺维持双方的关系？

耶鲁公开课 - 心理学导论课程节选

Well,the only people who would buy it are people who trust the bank that supports it, so in effect, the bank is promising to bail out the SIV if it should get in trouble.

只有人们相信设立SIV的银行的时候,他们才会去买SIV发行的票据,所以实际上,银行已经作出承诺,如果SIV陷入麻烦,银行会出面解决

耶鲁公开课 - 金融市场课程节选