Currency depreciation is not a feasible option for all advanced economies: they all need a weaker currency and better trade balance to restore growth, but they all cannot have it at the same time. So relying on exchange rates to influence trade balances is a zero-sum game.
货币贬值这个选项并不是对所有发达经济体而言都可行：它们固然都需要本币走弱，改善贸易平衡，但在同一时间，它们的货币不可能都贬值。所以靠汇率来平衡贸易是一个零和游戏。货币战争前景已然闪现，日本和瑞士已经先一步投入战斗，其他国家会紧随其后。