Wall Street slumps on worries about Fed, China, Greece

Wall Street slumps on worries about Fed, China, Greece

Stocks slumped at the open of trading in New York on Wednesday in response to further indications the Greek debt negotiations are ill fated — with European officials talking up emergency humanitarian plans for Greece should a euro exit happen — as well as further volatility, trading halts and deeper declines on the Chinese stock exchanges in the overnight session pushing the Shanghai Composite down 32% from its June high.