The joke should be; a German invites an Irishman, a Spaniard, a Portuguese and a Greek for a drink and asks them to pay.
The German owns a clip joint and the drinks are very expensive. They can’t afford for them so the German lends them the money at low interest because Goldman Sachs have just fiddled there accounts and credit rating. The Irishman, a Spaniard, a Portuguese and a Greek are so happy they decide to dink all night and the German is so happy until he finds out that Goldman Sachs has fiddled the books. The German tells the Irishman, a Spaniard, a Portuguese and a Greek that the inteest on his loan is now seven times higher. The Irishman, a Spaniard, a Portuguese and a Greek go home and tells their families that they cant afford food for the next twenty years.