A chart that gave the inequality a very visible and comprehensible form, the so-called "champagne glass" effect, was contained in the 1992 United Nations Development Program Report, which showed that distribution of global income is very uneven, with the richest 20% of the world's population controlling 82.7% of the world's income.
1992年的“联合国开发计划署报告”载有一个将不平等现象视为非常明显和易于理解的形式，即所谓的“香槟杯”效应 其中显示全球收入分配非常不平衡，全球最富有的20％的人口控制着世界收入的82.7％。