Global Inequality Trends

Greg Mankiw directs us to Xavier Sala-i-Martin:

Greg Mankiw's Blog: Inequality Trends: Here is an excerpt from a research paper by Columbia University economist Xavier Sala-i-Martin:

All indexes show a reduction in global income inequality between 1980 and 1998. We also find that most global disparities can be accounted for by across-country, not within-country, inequalities. Within-country disparities have increased slightly during the sample period, but not nearly enough to offset the substantial reduction in across-country disparities. The across-country reductions in inequality are driven mainly, but not fully, by the large growth rate of the incomes of the 1.2 billion Chinese citizens.

Unless Africa starts growing in the near future, we project that income inequalities will start rising again. If Africa does not start growing, then China, India, the OECD and the rest of middle-income and rich countries diverge away from it, and global inequality will rise. Thus, the aggregate GDP growth of the African continent should be the priority of anyone concerned with increasing global income inequality.

From Xavier's point of view, African development is now global job #1.