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双循环
通过索洛余值法，本研究估计了京津冀三地2006～2016年的资本和劳动力对产出的弹性，并进一步计算了全要素生产率及其指数。比较估算结果可以得到以下结论：第一，京津冀三地的科技水平差异较大，以保守的估算结果看，北京的全要素生产率也是河北的2倍多；第二，北京的科技进步最快，天津次之，河北最慢；第三，北京的科技创新优势未在科技水平上对天津和河北形成明显的溢出效应。
<<Through the Solow residual method，this study estimates the capital and labor elasticity of output from 2006 to 2016 in Beijing，Tianjin and Hebei.And then calculates the total factor productivity and its growth index.The results indicated following conclusions：First，there is a big gap in the level of science and technology of Beijing，Tianjin and Hebei.According to conservative results，the total factor productivity of Beijing is 2 times more than Hebei.Second，Technological progress of Beijing is the fastest，Tianjin is second，Hebei is the slowest.Third，Technological innovation advantage of Beijing has not a significant spillover effect on technology level of Tianjin and Hebei.
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