我国水产品海／淡比重对城镇居民额外消费支出的影响

我国水产品存在“质量”引致城镇居民额外消费支出现象，论文以Deaton理论为依据，利用VECM模型研究了海／淡产品结构对额外“质量”支出的影响。研究结果表明，海／淡比重调整是我国城镇居民“质量”消费支出增长的诱因，二者呈负相关关系，其中海水贝类与淡水甲壳类是导致该现象的重要因素。因此，一方面对水产品未来需要更全面和细分的价格监控，另一方面扩大海水产品比重（特别是贝类）有利于缓解城镇居民购买水产品时的额外支出增长。

The impact on households' additional spending by proportion of seafood / freshwater food in China

There is an additional spending in Chinese urban households＇ aquatic products consumption which caused by ＂quality＂. In this article, Deaton＇s theory is employed as a foundation. The impact on urban households＇ ＂quality＂ expenditure by yield structure of seafood / freshwater food is studied by VECM model. The result indicates that the change of yield structure of seafood / freshwater food is the reason for Chinese urban households＇ ＂quality＂ expenditure. They are negative correlation. Seawater shellfish and freshwater crustaceans are key factor. Therefore, price monitoring should be more comprehensive and detailed in the future. Moreover, increasing seafood proportion （especially in seawater shellfish） can help slowing spending in aquatic products. down the growth of urban households＇ additional