If taking use of price to measure quality growth directly, there will be some errors. Fortunately, the quality Engel curve gives us a useful tool and good viewpoint to estimate the quality growth.
如果直接用价格来衡量品质升级就会有所偏差，而品质恩格尔曲率则提供了一个良好的研究工具和研究视角。
If taking use of price to measure quality growth directly, there will be some errors. Fortunately, the quality Engel curve gives us a useful tool and good viewpoint to estimate the quality growth.
如果直接用价格来衡量品质升级就会有所偏差，而品质恩格尔曲率则提供了一个良好的研究工具和研究视角。
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