(Reuters) - Lucid Group said on Thursday that customers will get a $7,500 credit on buying certain variants of the Air luxury electric car, revving up a price war started by market leader Tesla Inc. startups such as Rivian Automotive Inc and Lucid to grab market share at a time when high borrowing costs and inflation have pinched consumer wallets. Lucid said in November that it had more than 34,000 orders in the third quarter, down by 3,000 from the second quarter, after it delivered about 1,400 vehicles and saw cancellations