2. A has executed a document in the form of a guaranty which imposes no obligation on A and has no value. B''s surrender of the document to A, if bargained for, is consideration for a promise by A to pay $10,000. Compare § 74.
　　2.A以保证书的形式制作了一个未对自己施加任何义务也没有任何价值的文件。如果经过协商，B交出文件给A，就是A支付10，000美元的允诺的约因。比较第74条。
　　c. Exchange of unequal values. To the extent that the apportionment of productive energy and product in the economy are left to private action, the parties to transactions are free to fix their own valuations. The resolution of disputes often requires a determination of value in the more general sense of market value, and such values are commonly fixed as an approximation based on a multitude of private valuations. But in many situations there is no reliable external standard of value, or the general standard is inappropriate to the precise circumstances of the parties. Valuation is left to private action in part because the parties are thought to be better able than others to evaluate the circumstances of particular transactions. In any event, they are not ordinarily bound to follow the valuations of others.
　　Ordinarily, therefore, courts do not inquire into the adequacy of consideration. This is particularly so when one or both of the values exchanged are uncertain or difficult to measure. But it is also applied even when it is clear that the transaction is a mixture of bargain and gift. See Comment c to § 71. Gross inadequacy of consideration may be relevant to issues of capacity, fraud and the like, but the requirement of consideration is not a safeguard against imprudent and improvident contracts except in cases where it appears that there is no bargain in fact.
　　c.不等值的交换。就经济中的生产性能量和产品的分配被留给私人行为(private action)的意义而言，交易的当事人可以自由确定他们自己的估价。争议的解决经常需要一个更一般意义上的市场价值基础上的价值确定(a determination of value)，而且这种价值经常被确定为多数私人估价基础之上的一个相似物。但在多数情况下，一个可信赖的价值的外在标准是不存在的，对于当事人的准确情形而言一般标准也是不适当的。估价被留给私人行为，原因之一是当事人被认为能够比他人更好地评价特定交易的情形。无论如何，他们通常是不能被限制而去遵从他人的估价的。

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