According to Der Spiegel credits given to European governments were disguised as "swaps" and consequently did not get registered as debt. As Eurostat at the time ignored statistics involving financial derivatives, a German derivatives dealer had commented to Der Spiegel that "The Maastricht rules can be circumvented quite legally through swaps," and "In previous years, Italy used a similar trick to mask its true debt with the help of a different US bank." These conditions had enabled Greek as well as many other European governments to spend beyond their means, while meeting the deficit targets of the European Union.

What was used to hide debts?