Central bankers have a favorite mantra: Patch the roof while the sun is shining.

But 10 years after the Federal Reserve worked alongside the European Central Bank and the Bank of Japan to bring the global economy back from the brink, their ability to prevent the next downturn is limited.

Whether the world's central banks are prepared to combat another slump is becoming less of a hypothetical question as the global economy shows signs of strain. The chances that the United States will enter a recession by next year have grown as manufacturing weakens and trade uncertainty drags on. In

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