Yet the treatment both of what is purchased from other firms and of the wastage of the firm's own equipment as a consequence of producing the marginal output involves the whole pack of perplexities which attend the definition of income.

然而，处理从其他公司购买的东西和公司自己的设备由于生产边际产出而造成的浪费涉及收入定义的所有难题。