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Runaway US debt levels at risks to global stability, the International Monetary Fund said in a report. Spiking Treasury yields are associated with exchange rate turbulence and higher interest rates elsewhere. The Congressional Budget Office projects debt-to-GDP levels to reach 116% by 2054.Ballooning US debt will weigh on more than just Washington, as spiraling borrowing costs have the potential to distort the global economy, according to the International...