The theory assumes that both labour and capital are mobile.

【assume】这个理论的前提是劳动力和资金都是流动的。

So I took th' book and tugged at it; but, Lord bless yo', it went on about capital and labour, and labour and capital, till it fair sent me off to sleep.

于是我拿起那本书，用力拉了一下；但是，上帝保佑你，它继续讨论资本和劳动，劳动和资本，直到它公平地让我睡着了。