{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T16:12:55Z","timestamp":1776355975871,"version":"3.51.2"},"reference-count":40,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,6,14]],"date-time":"2025-06-14T00:00:00Z","timestamp":1749859200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Data"],"abstract":"<jats:p>Income inequality has emerged as a defining challenge of our time, particularly in advanced economies, where the gap between rich and poor has reached unprecedented levels. This study analyzes income inequality trends from 2000 to 2023 across developed countries (the United States, the United Kingdom, Germany, and France) and developing nations using World Bank Gini coefficient data. We employ comprehensive visualization techniques, Pareto distribution analysis, and ARIMA time-series forecasting models to evaluate the effectiveness of the Kuznets curve as a predictor of income inequality. Our analysis reveals significant deviations from the traditional inverse U-shaped Kuznets curve across all examined countries, with persistent volatility rather than the predicted decline in inequality. Forecasts using ARIMA and neural networks indicate continued fluctuations in inequality through 2030, with the U.S. and Germany showing upward trends while France and the UK demonstrate relative stability. These findings challenge the conventional Kuznets hypothesis and demonstrate that contemporary inequality patterns are influenced by factors beyond economic development, including technological change, globalization, and policy choices. This research contributes to the literature by providing empirical evidence that the Kuznets curve has limited predictive power in modern economies, informing policymakers about the need for targeted interventions to address persistent inequality rather than relying on economic growth alone.<\/jats:p>","DOI":"10.3390\/data10060088","type":"journal-article","created":{"date-parts":[[2025,6,17]],"date-time":"2025-06-17T03:37:07Z","timestamp":1750131427000},"page":"88","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Rethinking Inequality: The Complex Dynamics Beyond the Kuznets Curve"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-4994-4800","authenticated-orcid":false,"given":"Sarthak","family":"Pattnaik","sequence":"first","affiliation":[{"name":"Department of Computer Science, Metropolitan College, Boston University, Boston, MA 02215, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9324-0091","authenticated-orcid":false,"given":"Maryan","family":"Rizinski","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Metropolitan College, Boston University, Boston, MA 02215, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3836-1851","authenticated-orcid":false,"given":"Eugene","family":"Pinsky","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Metropolitan College, Boston University, Boston, MA 02215, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,14]]},"reference":[{"key":"ref_1","unstructured":"Gomer-Carrera, R., Moshrif, R., Nievas, G., and Piketty, T. (2025, June 10). Global Inequality Update 2024: New Insights from Extended WID Macro Series. Available online: https:\/\/wid.world\/document\/global-inequality-update-2024-technical-note\/."},{"key":"ref_2","unstructured":"OECD (2025, June 10). Income Distribution Database (IDD). Available online: https:\/\/data360.worldbank.org\/en\/dataset\/OECD_IDD."},{"key":"ref_3","unstructured":"Gould, E., and Kandra, J. (2024). Wage Inequality Fell in 2023 Amid A Strong Labor Market, Bucking Long-Term Trends: But Top 1% Wages Have Skyrocketed 182% Since 1979 While Bottom 90% Wages Have Seen Just 44% Growth, Economic Policy Institute. Technical Report."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Dabla-Norris, E., Kochhar, K., Suphaphiphat, N., Ricka, F., and Tsounta, E. (2015). Causes and Consequences of Income Inequality: A Global Perspective, International Monetary Fund. IMF Staff Discussion Note SDN\/15\/13.","DOI":"10.5089\/9781513555188.006"},{"key":"ref_5","unstructured":"International Monetary Fund (2023). Causes and Consequences of Income Inequality: A Global Perspective, International Monetary Fund."},{"key":"ref_6","unstructured":"Cingano, F. (2014). Trends in Income Inequality and its Impact on Economic Growth. OECD Social, Employment and Migration Working Papers, OECD Publishing."},{"key":"ref_7","unstructured":"Milanovic, B. (2025, June 10). What can the Kuznets curve tell us about modern-day inequality? World Economic Forum, March 2016. Online Resource. Available online: https:\/\/www.weforum.org\/agenda\/2016\/03\/what-can-the-kuznets-curve-tell-us-about-modernday-inequality\/."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.ruje.2017.02.003","article-title":"Income inequality revisited 60 years later: Piketty vs. Kuznets","volume":"3","author":"Lyubimov","year":"2017","journal-title":"Russ. J. Econ."},{"key":"ref_9","first-page":"546","article-title":"Inequality in history: A long-run view","volume":"39","author":"Alfani","year":"2025","journal-title":"J. Econ. Subj."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1515\/spp-2021-0017","article-title":"Causes and Consequences of Income Inequality\u2014An Overview","volume":"12","author":"Polacko","year":"2021","journal-title":"Stat. Politics Policy"},{"key":"ref_11","unstructured":"Ekkehard, E., Langot, F., Merola, R., and Tripier, F. (2024). What Is Driving Wealth Inequality in the United States of America? The Role of Productivity, Taxation and Skills, ILO."},{"key":"ref_12","unstructured":"Mohammed, A. (UN News, 2021). Don\u2019t Let the Digital Divide Become \u2018The New Face of Inequality\u2019: UN Deputy Chief, UN News."},{"key":"ref_13","first-page":"1","article-title":"Economic Growth and Income Inequality","volume":"45","author":"Kuznets","year":"1955","journal-title":"Am. Econ. Rev."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1145\/3533382","article-title":"Deep learning for time series forecasting: Tutorial and literature survey","volume":"55","author":"Benidis","year":"2022","journal-title":"Acm Comput. Surv."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Kong, X., Chen, Z., Liu, W., Ning, K., Zhang, L., Marier, S.M., Liu, Y., Chen, Y., and Xia, F. (2025). Deep learning for time series forecasting: A survey. Int. J. Mach. Learn. Cybern.","DOI":"10.1007\/s13042-025-02560-w"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"20200209","DOI":"10.1098\/rsta.2020.0209","article-title":"Time-series forecasting with deep learning: A survey","volume":"379","author":"Lim","year":"2021","journal-title":"Philos. Trans. R. Soc. A"},{"key":"ref_17","unstructured":"Wike, R., Fetterolf, J., and Silver, L. (2025, June 10). Economic Inequality Seen as Major Challenge Around the World. Pew Research Center, 9 January 2025. Online Report. Available online: https:\/\/www.pewresearch.org\/global\/2025\/01\/09\/economic-inequality-seen-as-major-challenge-around-the-world\/."},{"key":"ref_18","unstructured":"Piketty, T. (2020). Capital and Ideology, Belknap Press of Harvard University Press."},{"key":"ref_19","unstructured":"Piketty, T. (2025). Nature, Culture, and Inequality: A Comparative and Historical Perspective, Scribe Publications."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"101402","DOI":"10.1016\/j.mex.2021.101402","article-title":"Literature Review on Income Inequality and Economic Growth","volume":"8","author":"Mdingi","year":"2021","journal-title":"MethodsX"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1203","DOI":"10.1016\/0014-2921(95)00030-5","article-title":"Income distribution, political instability, and investment","volume":"40","author":"Alesina","year":"1996","journal-title":"Eur. Econ. Rev."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1086\/654291","article-title":"Inequality and growth","volume":"11","author":"Benabou","year":"1996","journal-title":"Nber Macroecon. Annu."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"35","DOI":"10.2307\/2297811","article-title":"Income distribution and macroeconomics","volume":"60","author":"Galor","year":"1993","journal-title":"Rev. Econ. Stud."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"83","DOI":"10.2307\/2296292","article-title":"Alternative theories of distribution","volume":"23","author":"Kaldor","year":"1956","journal-title":"Rev. Econ. Stud."},{"key":"ref_25","unstructured":"Veblen, T. (1899). The Theory of the Leisure Class: An Economic Study of Institutions, Macmillan."},{"key":"ref_26","first-page":"100353","article-title":"Income inequality, status consumption and status anxiety: An exploratory review of implications for sustainability and directions for future research","volume":"6","author":"Pybus","year":"2022","journal-title":"Soc. Sci. Humanit. Open"},{"key":"ref_27","first-page":"85","article-title":"The Political Economy of the Kuznets curve","volume":"16","author":"Acemoglu","year":"2002","journal-title":"J. Econ. Perspect."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"e14947","DOI":"10.1016\/j.heliyon.2023.e14947","article-title":"Financialisation and income inequality: An investigation of the financial Kuznets curve hypothesis among developed and developing countries","volume":"9","author":"Khatatbeh","year":"2023","journal-title":"Heliyon"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1086\/450006","article-title":"Quantitative aspects of the economic growth of nations: VIII. Distribution of income by size","volume":"11","author":"Kuznets","year":"1963","journal-title":"Econ. Dev. Cult. Chang."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1111\/1475-5890.12368","article-title":"Income inequality in the United States, 1975\u20132022","volume":"45","author":"Hardy","year":"2024","journal-title":"Fisc. Stud."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"843","DOI":"10.1126\/science.1251868","article-title":"Skills, education, and the rise of earnings inequality among the \u201cother 99%\u201d","volume":"344","author":"Autor","year":"2014","journal-title":"Science"},{"key":"ref_32","unstructured":"Goldin, C., and Katz, L.F. (2008). The Race Between Education and Technology, Harvard University Press."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1043","DOI":"10.1016\/S0169-7218(11)02410-5","article-title":"Skills, tasks and technologies: Implications for employment and earnings","volume":"Volume 4","author":"Acemoglu","year":"2011","journal-title":"Handbook of Labor Economics"},{"key":"ref_34","unstructured":"Brynjolfsson, E., and McAfee, A. (2014). The Second Machine Age: Work, Progress, and Prosperity in a Time of Brilliant Technologies, W.W. Norton."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"733","DOI":"10.1086\/342055","article-title":"Skill-biased technological change and rising wage inequality: Some problems and puzzles","volume":"20","author":"Card","year":"2002","journal-title":"J. Labor Econ."},{"key":"ref_36","unstructured":"Pinker, S. (2019). Enlightenment Now, Penguin Books."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1177\/001872675400700202","article-title":"A Theory of Social Comparison Processes","volume":"7","author":"Festinger","year":"1954","journal-title":"Hum. Relations"},{"key":"ref_38","unstructured":"Wilkinson, R.G., and Pickett, K.E. (2023). The Enemy Between Us: The Psychological and Social Costs of Inequality. Eur. J. Soc. Psychol., 1\u201331."},{"key":"ref_39","unstructured":"Milanovic, B. (2025, April 26). Global Income Inequality by the Numbers: In History and Now\u2014An Overview, Available online: https:\/\/documents1.worldbank.org\/curated\/en\/959251468176687085\/pdf\/wps6259.pdf."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Scheidel, W. (2018). The Great Leveler, Princeton University Press.","DOI":"10.23943\/9780691184319"}],"container-title":["Data"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2306-5729\/10\/6\/88\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T17:52:06Z","timestamp":1760032326000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2306-5729\/10\/6\/88"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,6,14]]},"references-count":40,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2025,6]]}},"alternative-id":["data10060088"],"URL":"https:\/\/doi.org\/10.3390\/data10060088","relation":{},"ISSN":["2306-5729"],"issn-type":[{"value":"2306-5729","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,6,14]]}}}