September S&P 500 E-Mini futures (ESU24)are down -0.30%, and September Nasdaq 100 E-Mini futures (NQU24) are down -0.46% this morning, extending yesterday’s slump amid worries about a slowing U.S. economy, while investors awaited the latest reading on U.S. job openings. In yesterday’s trading session, Wall Street’s main stock indexes closed in the red, with the benchmark S&P 500 posting a 2-week low and the tech-heavy Nasdaq 100 posting a 2-1/2 week low. Boeing (BA) slumped over -7% after Wells Fargo downgraded the stock to Underweight from Equal Weight with a price target of $119. Also, chip …