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The answer to these questions cannot be resolved any time soon with standard econometric techniques because E-Commerce is too recent a phenomenon to be modeled in any defensible way. A different approach, therefore, seems called for, one that attempts to extrapolate judgmental estimates of the likely impact of the Internet at the industry level based on estimates by individual firms and analysts, suitably adjusted where appropriate, and then adds up the results to see what they imply for the overall economy.
答：One of the few things you can say about English with absolute certainty is that ...详情>>
