On the Evolution of the World Income Distribution

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Abstract
The post-World War I period has seen substantial changes in the world income distribution. As a result, the shape of the distribution has changed from something that looks like a normal distribution in 1960 to a bimodal 'twin peaks' distribution in 1988. Projecting these changes into the future suggests a number of interesting findings. First, it seems likely that the United States will lose its position as the country with the highest level of GDP per worker. Second, the future income distribution will involve far more 'rich' countries and far fewer 'poor' countries than currently observed.

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