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https://economicstars.com/2021/02/21/%d8%b9%d8%af%d9%85-%d8%a7%d9%84%d9%85%d8%b3%d8%a7%d9%88%d8%a7%d8%a9-%d9%81%d9%8a-%d8%a7%d9%84%d8%af%d8%ae%d9%84-income-inequality/
عدم المساواة في الدخل Income inequality