If the value of the mortgaged property exceeds that of the claim secured, the surplus may be mortgaged again, but not in excess of the surplus.

财产抵押后，该财产的价值大于所担保债权的余额部分，可以再次抵押，但不得超出其余额部分。

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Economists call this phenomenon "consumer surplus" - the excess value of a good beyond the actual price a consumer pays; what you would have been willing to pay, in other words, if you had to.

经济学家将这种现象称为“消费者盈余”，即商品价值超出消费者实际支付价格，换句话说如果不得不的话，而希望支付的价格。

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