Why are stocks so up and down lately?
New York — After months of steadily climbing higher, stocks are bouncing around as investors process renewed US-China trade tensions. Stocks were mixed on Tuesday in volatile trading: The Dow gained 203 points, or 0.44%, after falling as much as 615 points earlier. The S&P 500 fell 0.16%. The tech-heavy Nasdaq closed 0.72% lower after…