为了克服市场占有率指标的缺陷，Balassa（1987）提出了显示性比较优势（Revealed Comparative Advantage）指数，RCA指数是指一个国家某种产品的出口额占其出口总额的份额与全球该类产品出口额占全球出口总额的份额的比率。
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...agerberg(1995)建议用一个较小的数值对RCA进行调整，使之成为 对称的显示性比较优势(Revealed Symmetry Comparative Advantage，RSCA)指数。
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显示性比较优势指数 Revealed Comparative Advantage ; RCA ; Revealed Compartive Advantage Index ; Reve-lated Comparative Advantages
显示性比较优势指标 Revealed comparative advantage index
附加显示性比较优势 Additive Revealed Comparative Advantage
加显示性比较优势 Additive Revealed Comparative Advantage ; ARCA
的显示性比较优势 RCA ; revealed comparative Advantage
和附加显示性比较优势 Additive Revealed Comparative Advantage
国家显示性比较优势 REVEALED COMPETITIVE ADVANTAGE
对称的显示性比较优势 Revealed Symmetry Comparative Advantage
提出的显示性比较优势 Revealed Comparative Advantage
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上海蛋产品的显示性比较优势最小；
尽管中国主要出口产品的整体显示性比较优势状况处于一般状态，但却是朝着较强比较优势方向上升。
Although the revealed comparative advantage index of Chinese main export products as a whole indicates a general condition, it is actually towards a better condition.
本文分析了我国蔬菜出口的状况，并介绍了“显示性对称比较优势指数”概念。
The condition of Chinese vegetable export is analyzed. And then the concept of"Revealed Symmetric Comparative Advantage Index"(RSCA)is introduced.
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