There have already a number of theories to follow, such as the theories of monopoly advantage, internalization, product cycle, comparative advantage, and eclectic theory of international production.

• 经济学学者们对这种现象展开了广泛的研究，形成了多种理论，如垄断优势理论、内部化理论、产品生命周期理论、比较优势理论、国际生产折衷理论。