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 U.S. deficits and Europe's underinvestment. [....]