The epicenter of the next global supply chain snarl could be in South Korea as a nationwide trucker strike broadens and is hindering domestic economic activity, which may spill over to the rest of the world. Bloomberg reports that the Cargo Truckers Solidarity Union entered its seventh day of strikes on Monday, causing $1.6 billion in disruptions for auto, petrochemical, steel, and other top industries. South Korean steel-making company POSCO, the world’s fourth-largest steelmaker, has already limited production at some factories while the impacts are spreading across the economy. The strike has impacted companies in Seoul the hardest. Shares of...