本文使用Qu(2008)以及Oka and Qu(2011)分量迴歸下結構性改變檢定分析20世紀與二次世界大戰戰後不同區域與國家之高所得份額趨勢變化。不同以往一般結構性改變檢定，加入分量迴歸的概念研究一國家之高所得份額趨勢改變是否來自中高分量。不同區域的實證扣除考慮多個分量下沒有偵測出結構性改變的區域外，有一半支持高所得份額趨勢改變來自中高分量；戰後不同國家扣除考慮多個分量下沒有偵測出結構性改變的國家外，除了美國其餘國家都支持高所得份額趨勢改變來自中高分量。

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