Uncertainty over the government's survival and future of Greece's bailout program has spurred a second day of heavy selling on the Athens Stock Exchange, with the main index down a massive 9.4 percent.
Wednesday's plunge follows a loss of 5.7 percent the previous day. Yields on Greece's 10-year bonds also rose sharply, to above 7 percent.
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The losses come amid a wider drop in markets, but were exacerbated by a survey on Monday showing the opposition anti-bailout Syriza party had a lead over the governing party. That means the government could face an early election in February if the opposition lawmakers fail to back a candidate for the country's new president.
Conservative Prime Minister Antonis Samaras was to chair a cabinet meeting on the economy later in the day.