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I don't know about the state of economics but even if you say that it takes more than 20 years for new basics to reach the textbooks that still suggests to me that change in textbooks comes from basic research and not from applied research.

I have studied biology and the field makes progress in the sense that it discovers new facts that make it into textbooks.

To the extend that your charge that economists don't make progress in the sense of producing new knowledge that makes it into their textbooks we have to ask whether economics is really a science. Thomas Kuhn defined making progress as the critical element that distinguishes science from nonscience.