The U.S. dollar extended gains against some currencies after a surge the previous day, buoyed by signs of improvement in the U.S. economy such as better-than-expected home sales, durable goods and consumer confidence. The stronger dollar was partially a factor in Tuesday's sell off, as the strong dollar sent commodity prices falling, which in turn hit shares of material, oil and gas and industrial companies. Greece might miss a debt repayment on June 5 if it fails to receive bailout funds from creditors, who are demanding that the country make reforms to its economy. Missing those payments could destabilize the country's financial system and eventually push it out of the 19-country eurozone, a step that could shake the currency union and the global economy.