The Chinese EV maker expects volumes and margins to improve from the second quarter onward.Where will Nio (NIO 5.83%) stock find a bottom? That's the question investors in the electric vehicle (EV) stock must be asking right now. Shares plunged 21.7% in March, according to data provided by S&P Global Market Intelligence, and are now down 47% this year as of this writing.Why Nio stock fell so muchNio kicked off March on a somber note when its fourth-quarter and full-year 2023 numbers failed to impress invest ...