value on exchange

Love is often nothing but a favorable exchange between two people who get the most of what they can expect, considering their value on the personalitymarket.

爱往往仅仅是两个人类之间的某种有益的交换，他们通过自己在人格市场上的价值，得到最大的收益。（请帮忙检查这句，我不太有把握）

Listing on the stock exchange would place a market value on those shares.

公司可通过上市交易来赋予股份以市场价值。

Their exchange value depended not on their silver content, but on the fact that they could be exchanged at every instant, without delay and without cost, at their full face value against gold.

它们的交换价值并不取决于他们的含银量，而事实上是按其全部面值兑换黄金，而这种兑换又是可以在任何时刻无拖延、无成本地进行。