In many important areas, from the obsidian industry to religious tourism, Teotihuacán's success and prosperity typified the classic positive feedback cycle.

在许多重要的领域，从黑曜石产业到宗教旅游，特奥蒂瓦坎的成功和繁荣是典型的正反馈循环。

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So long as the feedback is positive (an important qualification), the result is a virtuous cycle of increasing returns for the idea.

FORBES: What Makes an Idea a Meme?