Squeaking at soft–rigid frictional interfaces

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Nor will they be useful if they remain too expensive to implement.

When Chávez became Venezuela's president in 1999, oil prices were climbing. In the early 2010s, a barrel would often fetch about $100, providing the government with plenty of money to pour into social programmes. But with current prices around the $65 mark, the country looks less like a reasonable investment.

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