Income Inequality and Aggregate Demand: An Empirical Evidence from Nigeria Digitalized Economy

Document Type : Research Paper

Authors

College of Social and Management Sciences, Department of Economics, Tai Solarin University of Education, Ijebu Ode, Nigeria.

10.22059/ier.2025.349926.1007562

Abstract

Income inequality has been so much evident in the last four decades as the rich are accumulating more wealth than the poor leading to changes in output, consumption, and employment. However, the concern in recent times of digitalized economies has been its effects on macroeconomic activities through the aggregate demand channel. This study examines the impact of income inequality on aggregate demand in Nigeria, the study data were gathered from the World Bank from 1985 to 2020. The study incorporates infant mortality rate and life expectancy as control variables while the Dynamic Ordinary Least Square (DOLS) was adopted as the method of estimation. The study's descriptive analysis shows that the variables are integrated at I(0) and I(1) while the DOLS result shows that income inequality, inflation, and life expectancy have a negative impact and significant relationship on aggregate demand. The study results also show a long-run relationship among the variables and it was thus concluded that increasing income inequality in Nigeria is detrimental to aggregate demand. The study recommends that government should increase its spending on social services, ensure direct transfer services to the poor and target fiscal and monetary policies that are inequality reduction driven.

Keywords

Main Subjects


Ademola, O. Y. (2019). Growth Impacts of Income Inequality: Empirical Evidence from Nigeria. Research in World Economy, 10(3), 226 – 262.
Aghion, P., Carrol, E., & Garrcia-Penalose, C. (1999). Inequality and Economic Growth: The Perspective of the New Growth Theories. Journal of Economic Literature, 37, 1615-1660.
Akinbobola, T. O., & Saibu, M. O. O. (2004). Income Inequality, Unemployment, and Poverty in Nigeria: A Vector Autoregressive Approach. The Journal of Policy Reform, 7(3), 175-183.
Alesina, A., & Rodrik, O. (1994). Distributive Politics and Economic Growth. Quarterly Journal of Economics. 108, 465 – 490.
Assa, J. (2012). Inequality and Growth Re-examined. Technology and Investment, 3(1), 1-12.
Atkinson, A. B., & Bourguignon, F. (2015). Handbook of Income Distribution (Eds.). Amsterdam: Elsevier.
Auclert, A., & Rognlie, M. (2018). Income Inequality and Aggregate Demand in The United States. Retrieved 12 January, 2023, from https://equitablegrowth.org/income-inequality-and-aggregate-demand-in-the-united-states/.
Ayinde O. E., Muchie M., Babatunde R. O., Adewumi M. O., Ayinde K. & Ibitoye O. (2012). Analysis of Income Inequality in Nigerian Agricultural Economy: A Case Study of Ekiti State. International Association of Agricultural Economists (IAAE) Triennial Conference, Foz do Iguaçu, Brazil, 18-24 August.
Bagchi, S., & Svejnar, J. (2015). Does Wealth Inequality Matter for Growth? The Effect of Billionaire Wealth, Income Distribution, and Poverty. Journal of Comparative Economics, 43(3), 505-530.
Bakare, A. S. (2012). Measuring the Income Inequality in Nigeria: The Lorenz Curve and Gini Co-Efficient Approach. American Journal of Economics, 2(1), 47–52.
Balisacan, A. M., & Fuwa, N. (2003). Growth, Inequality and Politics Revisited: A Developing-Country Case. Economics Letters, 79(1), 53-58.
Banerjee, A. V., & Duflo, E. (2003). Inequality and Growth: What Can the Data Say? Journal of Economic Growth, 8(3), 267-299.
Barro, R. J. (2000). Inequality and Growth in a Panel of Countries. Journal of Economic Growth, 5(1), 5 - 32.
Birdsall, N., Ross, D., & Sabot, R.  (1995). Inequality and Growth Reconsidered: Lessons from East Asia. The World Bank Economic Review, 9(3), 477-508.
Castelló-Climent, A. (2010). Inequality and Growth in Advanced Economies: An empirical Investigation. The Journal of Economic Inequality, 8(3), 293 - 321.
Chambers, D., & Dhongde, S. (2011). A Non-Parametric Measure of Poverty Elasticity. Review of Income and Wealth, 57(4), 683 - 703.
Chambers, D., & Krause, A. (2010). Is the Relationship Between Inequality and Growth Affected by Physical and Human Capital Accumulation? The Journal of Economic Inequality, 8(2), 153 - 172.
Chang, J. Y., & Ram, R. (2000). Level of Development, Rate of Economic Growth, and Income Inequality. Economic Development and Cultural Change, 48(4), 787 - 799.
Cheema, A. R., & Rehman, A. (2014). Existence of Kuznets Curve in Pakistan: Evidence from HIES Data Set, 1993 to 2011. International Journal of Business and Social Science, 5(5).
Chen, W. (2018). The Effects of Income Inequality on Economic Growth: Evidence from China (unpublished Doctoral dissertation), University of Bath. Retrieved From https://core.ac.uk/download/161921122.pdf
Darma, N. A., & Ali, M. (2014). An Empirical Analysis of the Effect of Income Inequality on Economic Growth in West Africa. Journal of Empirical Economics, 3(4), 221 - 231.
De Dominicis, L., Florax, R. J., & De Groot, H. L. (2008). A Meta-Analysis on The Relationship Between Income Inequality and Economic Growth. Scottish Journal of Political Economy, 55(5), 654 - 682.
De La Croix, D., & Doepke, M. (2003). Inequality and Growth: Why Differential Fertility Matters. American Economic Review, 93(4), 1091-1113.
Deininger, K., & Olinto, P. (1999). Asset Distribution, Inequality, and Growth. Retrieved from The World Bank.
Deininger, K., & Squire, L. (1998). New Ways of Looking at Old Issues: Inequality and Growth. Journal of Development Economics, 57(2), 259-287.
---------- (1996). A New Data Set Measuring Income Inequality. The World Bank Economic Review, 10(3), 565-591.
Delbianco, F., Dabús, C., & Caraballo, M. Á. (2014). Income Inequality and Economic Growth: New Evidence from Latin America. Cuadernos de Economía, 33(63), 381-398.
Easterly, W. (2007). Inequality Does Cause Underdevelopment: Insights from a New Instrument. Journal of Development Economics, 84(2), 755-776.
Ederer, S., & Rehm, M. (2019). Wealth Inequality and Aggregate Demand. Post Keynesian Economics Society, Working Paper, 1918, Retrieved from https://postkeynesian.net/media/working-papers/PKWP1918.pdf 
Enoma, O. (2020). Macroeconomic Policies on Poverty and Income Inequality in Nigeria: An Empirical Analysis. Journal of Humanities and Social Science, 25(8), 1-18.
Ewubare, D. B., & Nnamdi, K. C. (2020). Unemployment and Income Inequality in Nigeria. Journal of Social Science and Humanities Research, 5(11), 1–21.
Fallah, B. N., & Partridge, M. (2007). The Elusive Inequality-Economic Growth Relationship: Are There Differences Between Cities and the Countryside? The Annals of Regional Science, 41(2), 375-400.
Fawaz, F., Rahnama, M., & Valcarcel, V. J. (2014). A Refinement of The Relationship Between Economic Growth and Income Inequality. Applied Economics, 46(27), 3351-3361.
Forbes, K. J. (2000). A Reassessment of the Relationship between Inequality and Growth. American Economic Review, 90(4), 869-887.
Furman, J., & Stiglitz, J. E. (1998). Economic Consequences of Income Inequality. In Income Inequality: Issues and Policy Options. Retrieved from  https://www.kansascityfed.org/Jackson%20Hole/documents/3574/1998-S98stiglitz.pdf
Galor, O., & Zeira, J. (1989). Income Distribution and Macroeconomics. Brown University, Technical Report 25, Retrieved from https://www.brown.edu/Departments/Economics/Faculty/Glenn_Loury/louryhomepage/teaching/Ec%20237/Galor%20and%20Zeira%20(RES%201993).pdf
Galor, O., & Zeira, J. (1993). Income Distribution and Macroeconomics. The Review of Economic Studies, 60(1), 35-52.
Halter, D., Oechslin, M., & Zweimüller, J. (2014). Inequality and Growth: The Neglected Time Dimension. Journal of Economic Growth, 19(1), 81-104.
Herzer, D., & Vollmer, S. (2012). Inequality and Growth: Evidence from Panel Cointegration. The Journal of Economic Inequality, 10(4), 489-503.
Huang, H. C. R. (2004). A Flexible Nonlinear Inference to the Kuznets Hypothesis. Economics Letters, 84(2), 289-296.
Igwegbe, N. I., & Metu, A. G. (2021). Determinants of Income Inequality in Nigeria. Journal of Economic Studies, 18(1), 21-34.
Jalil, A. (2012). Modeling Income Inequality and Openness in the Framework of Kuznets Curve: New Evidence from China. Economic Modelling, 29(2), 309-315.
Joshi, R. (2018). Assessing the Impact of Income Inequality on Economic Growth: For a Cross Section of Indian States. The Indian Economic Journal, 65(1-4), 1-26.
Kaldor, N. (1955). Alternative Theories of Distribution. The Review of Economic Studies, 23(2), 83-100.
Kalecki, M. (1971). Selected Essays on the Dynamics of the Capital Economy. Cambridge: Cambridge University Press.
Knell, M. (1999). Social Comparisons, Inequality, and Growth. Journal of Institutional and Theoretical Economics (JITE)/Zeitschrift für die gesamte Staatswissenschaft, 664 - 695.
Knowles, S. (2005). Inequality and Economic Growth: The Empirical Relationship Reconsidered in the Light of Comparable Data. The Journal of Development Studies, 41(1), 135-159.
Kohlscheen, E., Lombardi, M. & Zakrajˇsek, E. (2021). Income Inequality and the Depth of Economic Downturns. Bank for International Settlement Working Papers, 943, Retrieved from https://www.bis.org/publ/work943.pdf
Lahouij, H. (2017). The Effects of Income Inequality on Economic Growth Evidence from MENA Countries. Awards for Excellence in Student Research and Creative Activity. Retrieved from https://core.ac.uk/download/pdf/154553817.pdf
Li, H., & Zou, H. F. (1998). Income Inequality is Not Harmful for Growth: Theory and Evidence. Review of Development Economics, 2(3), 318-334.
Lin, S. C., & Weng, H. W. (2006). A Semi-Parametric Partially Linear Investigation of the Kuznets' Hypothesis. Journal of Comparative Economics, 34(3), 634-647.
Lin, S. C., Huang, H. C., Kim, D. H., & Yeh, C. C. (2009). Nonlinearity Between Inequality and Growth. Studies in Nonlinear Dynamics & Econometrics, 13(2), 1-20.
Lin, Y. C., & Yeh, C. C. (2009). Joint Determinations of Inequality and Growth. Economics Letters, 103(3), 163-166.
Majeed, M. T. (2016b). Economic Growth, Inequality and Trade in Developing Countries. International Journal of Development Issues, 15(3), 240-253.
Mo, P. H. (2000). Income Inequality and Economic Growth. Kyklos, 53(3), 293-315.
Naguib, C. (2017). The Relationship Between Inequality and Growth: Evidence from New Data. Swiss Journal of Economics and Statistics, 153(3), 183-225.
Njindan Iyke, B., & Ho, S. Y. (2017). Income Inequality and Growth: New Insights from Italy. Retrieved from https://mpra.ub.uni-muenchen.de/78268/1/MPRA_paper_78268.pdf
Noh, Y. H., & Yoo, K. (2008). Internet, Inequality and Growth. Journal of Policy Modeling, 30(6), 1005-1016.
Okafor, H. O. (2011). Economic Growth, Poverty and Income Inequality Matrix in Nigeria: A Further Investigation. Economic and Financial Review, 54(1), 25–42.
Okpe, I. J., & Sule, A. (2020). Aggregate Demand and National Unemployment Level Nexus: Evidence from Nigeria. International Journal of Development Strategies in Humanities, Management and Social Sciences, 10(1), 114–126.
Oxfam (2017). Nigeria: Extreme Inequality in Numbers. Retrieved 12 January, 2023 from https://www.oxfam.org/en/nigeria-extreme-inequality-numbers .  
Panizza, U. (2002). Income Inequality and Economic Growth: Evidence from American Data. Journal of Economic Growth, 7(1), 25-41.
Partridge, M. D. (1997). Is Inequality Harmful for Growth? Comment. The American Economic Review, 87(5), 1019-1032.
Pasinetti, L. (1962). Income Distribution and Rate of Profit in Relation to the Rate of Economic Growth. Review of Economic Studies, 29(4), 267 – 279.
Perotti, R. (1996). Growth, Income Distribution, and Democracy: What the Data Say. Journal of Economic Growth, 1(2), 149 - 187.
---------- (1994). Income Distribution and Investment. European Economic Review, 38(3-4), 827 - 835.
Persson, T., & Tabellini, G. (1994). Is Inequality Harmful for Growth? American Economic Review, 84, 600–621.
Ravallion, M. (2001). Growth, Inequality and Poverty: Looking Beyond Averages. World Development, 29(11), 1803 - 1815.
Rehme, G. (2002). Education, Economic Growth and Personal Income Inequality Across (Rich) Countries. Retrieved from http://www.lisdatacenter.org/wps/liswps/300.pdf
Robert, C. J. (2017). Inequality and Aggregate Demand in the IS-LM and IS-MP Models. Bulletin of Economic Research, 70(3), 307 - 3378.
Shin, I. (2012). Income Inequality and Economic Growth. Economic Modelling, 29(5), 2049 -2057.
Steindl, J. (1976). Maturity and Stagnation in American Capitalism (4). New York: NYU Press.
Sukiassyan, G. (2007). Inequality and Growth: What Does the Transition Economy Data Say? Journal of Comparative Economics, 35(1), 35-56.
Tanninen, H. (1999). Income Inequality, Government Expenditures and Growth. Applied Economics, 31(9), 1109-1117.
Thornton, J. (2001). The Kuznets Inverted-U hypothesis: Panel Data Evidence from 96 Countries. Applied Economics Letters, 8(1), 15-16.
Tiwari, A. K., Shahbaz, M., & Islam, F. (2013). Does Financial Development Increase Rural-Urban Income Inequality? Cointegration Analysis in the Case of Indian Economy. International Journal of Social Economics, 40(2), 151-168.
Vo, D. H., Nguyen, T. C., Tran, N. P., & Vo, A. T. (2019). What Factors Affect Income Inequality and Economic Growth in Middle-Income Countries? Journal of Risk and Financial Management, 12(1), 40–52.
Yameogo, C. E., & Dauda, R. (2022). The Effect of Income Inequality and Economic Growth on Environmental Quality: A Comparative Analysis between Burkina Faso and Nigeria. Journal of Public Affairs, 22(3), e2566.
Wahiba, N. F., & El Weriemmi, M. (2013). The Relationship between Economic Growth and Income Inequality. International Journal of Economics and Financial Issues, 4(1), 135-143.
Wan, G., Lu, M., & Chen, Z. (2006). The Inequality–Growth Nexus in the Short and Long Run: Empirical Evidence from China. Journal of Comparative Economics, 34(4), 654 -667.
World Bank. (2021). World Development Indicators. Retrieved from https://databank.worldbank.org/source/world-development-indicators