When Greece used the euro as currency to make Greece loan easily. The Government of Greece was used to finance the expenses of Government waste, so very high, while the tax revenue does not meet the target.
When Greece use the euro as currency. Greece loan made easy Greece's government was wasting money. The cost is very high, while government revenue from taxation did not meet the targets.
When Greece euro is the currency used to Greece to borrow money easily, government of Greece's money as wasteful. Cost the government is very high, while income from taxation did not meet the target.