European Central Bank President Christine Lagarde on Monday urged global leaders to discuss undervaluation of the Chinese currency as a facet of the imbalances endangering the global economy. China has consistently denied that it manipulates its currency for trade advantage but its surging trade surpluses are one of several macroeconomic mismatches worrying leaders of the Group of Seven (G7) nations who met last week in France, along with chronic US deficits and Europe’s...