everything应该是know的宾语啦那就

句中的情况少，句首和句末多，句中少见

谢谢以上各位

这个句子不难。主句就是：

Everything is already.

增加成分：

Everything(to profit from economy ) is already (contained).

再增加成分
Everything ((that one needs to know )to profit from economy) is already (contained( in those two sources)).

所以，to ..  是介词结构做everything的后置定语， Everything 是整个句子的主语，也是that... 句子know的宾语，