Between 2000 and 2008, the world's GDP effectively doubled, going from 32 trillion to 60.6 trillion. Depending on your definition of fairness, in a fair world, either of the following would have happened:
1. Everyone's wealth would have increased equally.
2. The gap between rich and poor would have narrowed.
Instead, the gap between rich and poor continues to grow.
ETA: Here's an article covering the same time period: Gap Between Rich And Poor Growing - CBS News: "Gap Between Rich And Poor Growing Study Of Global Income Inequality Shows U.S. Middle Income, Poor Falling Further Behind Since 2000"