There is a structural imbalance between benefits and contributions, and the system is unsustainable, he says.

ECONOMIST: Italian pensions

But what enabled the banking crisis to happen was a structural imbalance in the growth model of the global economy over the last two decades.

WSJ: We Need Greater Global Governance

As we debate how to step back from the fiscal cliff, it is imperative that we use this moment to address the long-term structural causes of the imbalance between revenues and spending.

FORBES: Merck CEO: Health Care Beyond the Fiscal Cliff Requires Structural Changes

He should offer China a truce if it sticks to structural reforms that reduce its external imbalance.

ECONOMIST: Mitt Romney��s economics