This is like chicken-and-egg.

这就像是先有鸡还是先有蛋的道理。

在美国你说chicken-and-egg别人就知道你在说先有鸡还是先有蛋的问题，跟中文的用法差不多，都是用来比喻一件事不知谁先谁后。例如你说Does that the book become famous because of the author? It's just like chicken-and-egg.