Greek stock market tumbles after five-week shutdown

Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. National Bank of Greece , the country's largest commercial bank, was down 30 percent, the daily volatility limit. Trading on the Athens bourse was suspended in late June as part of capital controls imposed to stem a debilitating outflow of euros that threatened to collapse Greece's banks and hurl the indebted