過去已有許多經濟學家致力於研究全球化如何影響所得不均度，然這些文獻有以下兩點問題，第一，多數的文獻都是使用吉尼係數來衡量所得不均度，由於家戶調查並非準確的所得統計資料且不容易取得高所得者的所得資訊，使得吉尼係數較難精確地描繪一國所得分配的變化。第二，文獻也較少考量到模型中可能存在的內生性問題。

在本文中，上述問題都將被考量在內，本文利用30個國家在1985年至2010年間的非平衡長期縱橫資料(unbalance panel data)，以高所得者所得份額(Top x % Income Share)取代吉尼係數來衡量所得不均度，並利用兩階段最小平方法來解決模型存在的內生性問題。

本文的實證結果顯示，進出口占GDP之比重、出口占GDP之比重、對內外人直接投資占GDP之比重對所得不均度有負向顯著的效果。若將國家分成開發中和已開發國家，已開發國家實證結果仍然顯示全球化會對所得不均會產生負向的影響，但在開發中國家的估計結果則不顯著。最後，以高所得群體內部的所得不均度來看也有相同的結論，結果顯示，全球化也會使高所得群體內部的所得不均度下降。

For a long time economists have been working on the effects of globalization on income inequality. There are two shortcomings in past literature. First, most of these literature use Gini coefficient to measure income inequality. Due to the household surveys is not accurate income statistics and lack the income information of high-income, Gini coefficient can’t accurately measure income inequality in the country. Second, literature don’t control the endogeneity in the models.

In this paper, these shortcomings are addressed. We use unbalance panel data of 30 countries from 1985 to 2010. We employ Top x % income share to measure income inequality rather than Gini coefficient. Additionally, we use two stage least squares approach to control the endogeneity in the model.

Our empirical results show that the import plus export to GDP ratio, the export to GDP ratio and the inward foreign direct investment to GDP ratio have a negative significant effect on income inequality. If we divide countries into developing and developed countries, the empirical results of developed countries still show that the globalization have a negative effect on income inequality. However, we find no robust effect of globalization on income inequality in developing country. Furthermore, a similar results holds for top income inequality: globalization would lead to lower level of top income inequality.

中文文獻
1.蘇奕璿 (2008)，「全球化與貧富不均的關係-縱橫門檻回歸模 型之實證研究」，國立清華大學經濟所碩士論文

2.行政院主計處 (2014)，「總體統計資料庫」，
http://statdb.dgbas.gov.tw/pxweb/Dialog/statfile9L.asp

英文文獻
1.Alderson, A. S. and F. Nielsen. (2002). "Globalization and The Great U-Turn Income Inequality Trends in 16 OECD Countries." American Journal of Sociology, 107(5) : 1244-1299.

2.Alvaredo, Facundo, Anthony B. Atkinson, Thomas Piketty and Emmanuel Saez,. (2015). "The World Top Income Database",
http://topincomes.g-mond.parisschoolofeconomics.eu/

3.Asteriou, D.,Sophia Dimelis, and Argiro Moudatsou. (2014). "Globalization and Income Inequality: A Panel Data Econometric Approach for The EU27 Countries." Economic Modelling, 36: 592-599.

4.Atkinson, A. B., Thomas Piketty, and Emmanuel Saez. (2011). "Top Incomes in the Long Run of History." Journal of Economic Literature, 49(1): 3-71.

5.Baier, S. L. and J. H. Bergstrand. (2007). "Do Free Trade Agreements Actually Increase Members' International Trade?" Journal of International Economics, 71(1): 72-95.

6.Bandelj, N. and M. C. Mahutga. (2008). "Foreign Investment and Income Inequality: The Natural Experiment of Central and Eastern Europe." International Journal of Comparative Sociology, 49(6): 429-454.

7.Breau, S. and David L. Rigby.﹙2010﹚. "International Trade and Wage Inequality in Canada" Journal of Economic Geography, 10(1): 55-86

8.Borraz, F. and J. E. Lopez-Cordova. (2007). "Has Globalization Deepened Income Inequlity in Mexico." Global Economy Journal, 7(1) .

9.Burkhauser, Richard V.,Jan-Emmanuel De Neve and Nattavudh Powdthavee. (2015). "Top incomes and Human Well-being Around the World." Said Business School Research paper 2015-25

10.Chiquiar, D. (2008). "Globalization, Regional Wage Differentials and The Stolper–Samuelson Theorem: Evidence from Mexico." Journal of International Economics, 74(1): 70-93.

11.Dreher, A. and N. Gaston. (2008). "Has Globalization Increased Inequality?" Review of International Economics, 16(3): 516-536.

12.Egger, H. and U. Kreickemeier. (2012). "Fairness, Trade, and Inequality." Journal of International Economics, 86(2): 184-196.

13.Feenstra, R. C. and G. H. Hanson. (1996). "Foreign Investment, Outsourcing and Relative Wages." Political Economy of Trade Policy: Essays in Honor of Jagdish Bhagwati, Cambridge, MIT Press, 89-128.

14.Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table", Forthcoming American Economic Review, www.ggdc.net/pwt

15.Heshmati, A. (2003). "Measurement of a multidimentional index of globalization and its impact on income inequality." WIDER Discussion Paper, No. 2003/69.

16.Hirte, G. and C. Lessmann. (2014). "Trade, Integration, and Interregional Inequality." Beiträge zur Jahrestagung des Vereins für Socialpolitik 2014:
Evidenzbasierte Wirtschaftspolitik - Session: International Trade and Development, No. D18-V3

17.Jaumotte, F., S. Lall, and C. Papageorgiou. (2013). "Rising Income Inequality : Technology, or Trade and Financial Globalization?" IMF Economic Review, 61(2): 271-309.

18.Jensen, N. M. and G. Rosas. (2007). "Foreign Direct Investment and Income Inequality in Mexico, 1990–2000." International Organization, 61(03): 467-487.

19.Krugman, P. and A. J. Venables. (1995). "Globalization and The Inequality of Nations." The Quarterly Journal of Economics, 110(4): 857-880.

20.Kumar, U. and P. Mishra. (2008). "Trade Liberalization and Wage Inequality: Evidence from India." Review of Development Economics, 12(2): 291-311.

21.Lee,Cheol-Sung. (2005). "Income Inequality, Democracy, and Public Sector Size." American Sociological Review, 70(1): 158-181.

22.Li, Q. and R. Reuveny. (2003). "Economic Openness, Democracy, and Income Inequality: An Empirical Analysis." Comparative Political Studies, 36(5): 575-601.

23.Lim, G. C. and P. D. McNelis. (2015). "Income Growth and Inequality: The Threshold Effects of Trade and Financial Openness." IMF Conference paper
https://editorialexpress.com/cgi-bin/conference/download.cgi?db_name=CEF2015&paper_id=407

24.Milanovic, B. (2002). "Can We Discern the Effect of Globalization on Income Distribution Evidence from Household Budget Surveys." The World Bank Economic Review, 19(1): 21-44.

25.Organisation for Economic Co-operation and Development. (2014). "OECD stat (database)", http://stats.oecd.org/

26.Piketty, Tomas. (2014) Capital in the Twenty-First Century. Cambridge: Harvard University Press。

27.Rodríguez-Pose, A. (2012). "Trade and Regional Inequality." Economic Geography, 88(2): 109-136.

28.Stock, J. H. and M. Yogo. (2005). "Testing for Weak Instruments in Linear IV Regression." In Identification and Inference for Econometric Models: Essays in Honor of Thomas Rothenberg, ed, W. K. Andrews, and James H. Stock., 80-108.

29.Stolper, W. F.and Samuelson, Paul A. (1941) "Protection and Real Wages." The Review of Economic Studies(Oxford Journals), 9(1): 58-73

30.United Nations Conference on Trade and Development. (2014). "UNCTAD statistics", http://unctadstat.unctad.org/wds/ReportFolders/reportFolders.aspx?IF_ActivePath=P,5&sCS_ChosenLang=en

31.Wei, Shang-Jin. and Yi. Wu. (2001). "Globalization and Inequality Evidence from Within China." National Bureau of Economic Research Working Paper, No.8611.

32.Wood, A. (2002). "Globalization and Wage Inequalities: a Synthesis of Three Theories." Weltwirtschaftliches Archiv, 138(1): 54-82.

33.Wooldridge, J. M. (2013) Introduction Econometrics: A Modern Approach. Canada: Cengage Learning.

34.World Bank. (2014). "World Development Indicators",
http://data.worldbank.org/data-catalog/world-development-indicators/wdi-2014

35.World Trade Organization. (2014). "Regional Trade Agreements Database",
http://rtais.wto.org/UI/PublicMaintainRTAHome.aspx

36.Zhang, X. and K. H. Zhang. (2003). "How Does Globalization Affect Regional Inequality Within a Developing Country? Evidence from China." Journal of Development Studies, 39(4): 47-67.