The S&P 500 and Nasdaq indexes fell at the start of Wednesday’s trading session as Wall Street pondered the long-term implications of a federal government shutdown and its impact on the US economy.The S&P shed 0.2% while the Nasdaq Composite lost 0.3%, falling more than 70 points just after the opening bell on Wednesday.The Dow Jones Industrial Average hovered near flat after an early 52-point decline. 3 The major stock indexes fell on Wall Street on Wednesday as investors digested the news of a federal g ...