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1·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。