The G20 summit opens Friday to a melancholic backdrop. Discontent about stagnant incomes and anxieties over the economic future will bring leaders from outside the traditional political establishment to Hamburg, who do not automatically support an international order based on market principles and open economies. Brazil will not even send its leader; India and China face serious military tension. Russia is viewed suspiciously as interfering in political outcomes in advanced economies. Turkey, South Africa, Saudi Arabia, Australia and South Korea are beleaguered by domestic and regional challenges. The US has rejected the Paris Climate Accord. The UK is caught in
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