关于代词it在定语从句中的修饰问题

题目

关于代词it在定语从句中的修饰问题
His fortune is greater or less,precisely in proportion to the extent of this power; or to the quantity either of other men's labour,or,what is the same thing,of the produce of other men's labour,which it enables him to purchase or command.最后一句当中的it 请问是指代什么,该怎么判断?

答案

最后一句当中的it 我认为 是代替的 是 His fortune
也就是 His fortune enables him to purchase or command the .