The liner carrier Mediterranean Shipping Co. said Wednesday it plans to raise rates on U.S. East Coast export shipments to the west coast of South America. The increases are $150 per 20-foot container and $300 per 40-foot container to west coast South America ports, excluding Cartagena, and $100 per 20-foot container and $200 per 40-foot container to Cartagena. They’re effective from May 1....