General Motors has extended plant closures at four factories due to a continued shortage of semiconductors while it will “leverage every available semiconductor to build and ship our most popular and in-demand products, including full-size trucks and SUVs for our customers”. That indicates a focus on higher margin products and flexible operating platforms. The firm’s Mexican factory closure is extended by four weeks. Mexican imports of auto parts linked to GM already slumped 66.4% lower year over year in January 2021. That’s somewhat faster than the reduction in total imports of autopart...