I can’t see any logical reason to connect these two variables, but lots of people seem to think they are connected. So I thought I’d look at the evidence. I found an OECD study that looks at income growth for the top 10% and the bottom 10%, between the mid-1980s and the late 2000s. It seems reasonable to assume that if the income of the rich is growing much faster than the income of the poor, then inequality is increasing, and vice versa. So rather than look at all countries, let’s focus on those where the difference is significant, say more than 1% per annum. There are 8 countries where the rich did much better than the poor, headed by Sweden:
| Country | Top 10% | Bottom 10% | Gap |
| Sweden | 2.4% | 0.4% | 2.0% |
| Britain | 2.5% | 0.9% | 1.6% |
| Germany | 1.6% | 0.1% | 1.5% |
| New Zealand | 2.5% | 1.1% | 1.4% |
| USA | 1.5% | 0.1% | 1.4% |
| Norway | 2.7% | 1.4% | 1.3% |
| Finland | 2.5% | 1.2% | 1.3% |
| Holland | 1.6% | 0.5% | 1.1% |
| Portugal | 1.1% | 3.6% | (2.5%) |
| Greece | 1.8% | 3.4% | (1.6%) |
| Spain | 2.5% | 3.9% | (1.4%) |
| Ireland | 2.5% | 3.9% | (1.4%) |
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