NEW YORK (TheStreet) -- Shares of National Bank of Greece closed up 6.37% to $1.67 on Monday after Syriza party leader Alexis Tsipras said Sunday that Greece would remain in the Eurozone even if his party wins the nation's general election later this month. "It's clear from any point of view that the subject of Greece leaving the euro simply does not exist," Tsipras told Greek weekly Realnews ...