And all labour, according to our present definition, must be classed as unproductive, which terminates in a permanent benefit, however important, provided that an increase of material products forms no part of that benefit.

• 按照我们在本书中所下的定义，所有那些带来持久利 益的劳动，只要所获得的利益中不包含物质产品的增加，则不论多么重要，都应归入非 生产性劳动类。