The electric vehicle upstart is struggling. Can it turn the corner?Making cars is tough, and it's even tougher if you start a new vehicle brand from scratch. The huge upfront investments required for production create a barrier to entry, so very few new automotive brands achieve sustainable success. Recent examples include Tesla and BYD, but there are dozens of failures for every successful car business.Rivian Automotive (RIVN -5.23%) is trying to become the next sustainable automotive brand. By focusing on ...