The U.S. greenback surged Friday, capping off the biggest weekly dollar rally in three and a half years, as the euro slumped on speculation the European economy would continue to weaken.

State-run sovereign wealth funds are diversifying away from the U.S. dollar, as well as dollar denominated assets, at an unheralded pace, as the greenback’s protracted declined undermines the credibility of U.S. policymakers.

A private-equity consortium headed up by Candover Partners Ltd., a wholly owned subsidiary of Candover Investments PLC, and Goldman Sachs Group Inc. (GS) has boosted its initial bid for U.K.-based Expro International Group PLC (PINK: EXPRF) by 8%, just narrowly beating out Halliburton Company’s (HAL) $3.4 billion (1.71 billion pounds) cash offer.