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The tracks of arrears "China has similar debt levels to America, despite being only 20% as rich as it per person. Portugal has similar leverage to Sweden, which is almost twice as wealthy as it. Troubled Greece’s debt-to-GDP is on a par with that of prosperous Norway’s. Countries with disproportionately high debts are more prone to crises. But working out how to shrink-debt to GDP without causing a slump is tough—as China is discovering".