Bank shares suffered most, hitting or nearing the daily trading limit of a 30 per cent loss. Markets in the rest of Europe, however, were largely unaffected.
The stock market and banks were closed on June 29, when the government put limits on money withdrawals and transfers to keep a run on the banks from bringing down the financial system. Greeks were panicking over the prospect that the country could fall out of the euro after its talks creditors broke down.
Two surveys published today illustrate the extent of the damage wreaked on the Greek economy in July by the bank closures, money controls and general uncertainty over the country's future.
Financial information company Markit said its gauge of manufacturing activity in Greece plummeted during the month to 30.2 points, its lowest ever reading, despite improvements across the rest of the 19-country eurozone.
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"Manufacturing output collapsed in July as the debt crisis came to a head," Markit economist Phil Smith said.
"Factories faced a record drop in new orders and were often unable to acquire the inputs they needed, particularly from abroad, as bank closures and capital restrictions badly hampered normal business activity."
"The negative development is the result of the sharp deterioration in business expectations in all areas, but also a recent and significant decline in consumer confidence," said the Foundation for Economic and Industrial Research, or IOBE, which conducts the survey.
Greece is currently in intense negotiations with bailout lenders to negotiate the terms of a massive new rescue package in the next two weeks.
The country needs to complete the talks and get more loans before August 20, when it has to repay more than 3 billion euros to the European Central Bank.