本文引用Hansen (1999)門檻模型，針對1960年至2005年62個國家資料作橫斷面分析，客觀估計貿易自由化對高、低所得國家之所得分配影響。實證結果指出在低所得國家商品自由化大致會惡化國內所得分配，在高所得國家商品自由化大致上對國內所得分配無顯著影響；而外人直接投資對低所得國家所得分配無影響，在高所得國家外人直接投資將顯著惡化國內所得分配。此結果意味著各國可依其經濟發展程度適當地調整開放政策，以利於國內長期經濟發展與所得分配。

This paper empirically investigates the threshold effects of openness on income inequality. Specifically, we use Hansen’s (1999) threshold regression model to examine whether the openness-inequality link varies with the degree of a country’s income. Applying to 62 countries during the period of 1996-2005, we find that there indeed exists an income threshold in the openness-inequality link. Moreover, the opening of goods markets increases income inequality in low-income countries; however, in high-income ones trade openness has minor effects. By contrast, foreign direct investment is found to increase income inequality in high-income and have an unimportant effect in low-income one. These findings suggest that to reduce income inequality, the governments need to consider their positions in the economic development process and adopt relevant openness strategies.

目錄
表目錄	II
第一章 緒論	1
第二章 文獻回顧	4
第一節 理論文獻	4
第二節 實證文獻	10
第三章 資料來源與模型設定	16
第一節 變數介紹	16
第二節 模型設計	23
第四章 實證分析	25
第一節 傳統估計結果分析	25
第二節 門檻估計結果分析	33
第五章 結論與建議	45
參考文獻	48
附錄	54

表目錄
表 1 變數定義與來源	18
表 2 變數基本檢定統計量和相關係數矩陣	21
表 3 普通最小平方法線性實證結果	26
表 4 工具變數法線性實證結果	27
表 5 普通最小平方法考慮交叉項之實證結果	29
表 6 工具變數法考慮交叉項之實證結果	31
表 7 門檻實證結果(以吉尼成長率作為應變數)	34
表 8 門檻實證結果(以第一五分位之所得份額成長率作應變數)	38
表 9 外人直接投資之門檻實證結果	42

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