Pressure piled on Germany to stop stalling a package to rescue Greece from crippling debts Wednesday as the International Monetary Fund's chief said confidence in the whole eurozone was on the line. As the euro hit a one-year dollar low after Greek debt was slashed to junk, the country's prime minister said a "common effort" was needed from the EU and eurozone to prevent world economies from being engulfed by a new crisis. Greece acted to stop speculators operating on the Athens stock exchange as the interest rate it has to pay to borrow money hit 11.1 percent, only trailing Pakistan and Venezuela in the world's highest interest payers.