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A new Pew Research Center report is a gold mine of information that I’ll be returning to in the next few days and weeks. But given the intensification of the Greece crisis this weekend, it seems especially important to note briefly what it shows about that country’s experience in the Eurozone. It’s especially revealing on how the easy access to credit made possible by Greece’s membership created one of history’s most stunning examples of false prosperity.

Among other statistics, Pew’s study of global incomes over the last decade presents figures on the shares of many national populations that could be classified as “high income” in 2001 and 2011. And the Greece numbers are mind-blowing. In 2001, 10.8 percent of Greeks belonged in the category with family per person income (or consumption) of $50 or more per day. (These figures are expressed in 2011 dollars adjusted for differences in price levels across countries.) By 2011, this share had more than doubled – to 23.8 percent. Moreover, the share of “upper middle income” ($30-$50 per capita per day) Greeks by this measure increased from 49.8 percent to 54.2 percent.

Even given the relatively low base from which Greek incomes began, it has to be significant that the only other countries in Western Europe that saw anything close to this progress were the continent’s other problem debtors. In Italy, for example, the high income share of the population just about doubled, from 17.1 percent to 34.8 percent. Spain saw 18.4 percent to 27.3 percent growth in this category, and the numbers were 21.2 percent to 36.2 percent in Ireland. (Pew did not present any figures for Portugal.)

Among economically and financially healthier Western European countries, oil rich Norway’s high income residents rose from 56.3 percent of the population to 77.2 percent, while the comparable numbers for France were 27.3 percent and 37.9 percent.

Moreover, Greece was a major out-performer in the Upper Middle class as well. In Italy, Spain, and Ireland, this group fell as a share of the population from 2001 to 2011. Ditto for France.

In case you’re wondering, the United States is one of the few wealthy countries studied that saw a decline in its share of the population living on more than $50 per day between 2001 and 2011 – from 58.2 percent to 55.7 percent. The Upper Middle class increased only from 31.4 percent of the American people to 31.9 percent. And therein hangs many a tale, as I’ll be reporting.