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| The Geography and Evolution of Complex Knowledge：Take the Yangtze River Economic Belt as an Example |
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Abstract There is consensus among scholars and policy makers that knowledge is one of the key drivers of longrun economic growth.It is also clear from the literature that not all knowledge has the same value.However, too often in economic geography we have been obsessed with counting knowledge inputs and outputs rather than assessing the quality of knowledge produced.In this article we measure the complexity of knowledge, we map the distribution and the evolution of knowledge complexity in the Yangtze River economic belt, and based on patent records from the State Intellectual Property Office to explore how the spatial diffusion of knowledge is linked to complexity. It finds out that knowledge complexity is unevenly distributed and that cities with the most complex technological structures are not necessarily those with the highest rates of patenting.The joint invention patents indicate that more complex patents are less mobility than less complex patents when joint inventors are located in different cities.
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