Li Auto stock is looking expensive. Citigroup likes it, but can't recommend buying it at this price. Shares of Chinese electric carmaker Li Auto (LI -0.48%) leapt 6% higher through 11 a.m. ET Monday. Probably partly because of China's stimulus effort to jump-start its economy and boost demand for electric cars and other consumer products, which is helping many Chinese stocks today. But partly, the reason is Citigroup, which just raised its price target on Li stock for the second time in a week. Why Citi kee ...