Borrowing was both the shaky foundation of global growth and the cause of its collapse. It started with a bust and it ended with an even bigger bust. In between was sandwiched an unsustainable boom. Banks have been humbled. Economists have been found wanting. Geopolitical power began to shift from west to east. That was the noughties that was. It barely seems five minutes ago that policymakers were fretting about the...

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