"This paper uses data on rates of improvement to discuss when new technologies or systems composed from them might become economically feasible. Technologies must provide some level of performance and price for specific applications before they will begin to diffuse and technologies that experience rapid rates of improvement are more likely to become economically feasible for a growing number of applications than are other technologies. Drawing from a large data base on rates of improvement, this paper describes a set of plausible futures that are very different from ones that are presented in public forums."

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