As clusters were selected using land-use variables, geographical continuity is not mandatory and neither is homogeneity of cluster size (number of member zones).
A slowdown in the 17-member zone poses a threat to the other 10 E.U. states that retain their own national currencies.
Earlier on Thursday, PMI surveys for the euro area suggested that the 17-member zone continued to clamber out of recession in the third quarter.
Robert Barrie, of Credit Suisse First Boston, uses a rule of thumb that shows that while policy is loose for some countries it is tight for others much as you would expect in a 12-member zone.
Once in Hungary, migrants will have entered the Schengen Area, the 26 EU-member zone with no border controls, making their destination countries in Western Europe significantly easier to reach.
In this current setup, the 17-member euro zone by itself cannot muster a sufficient majority.
Economic imbalances within the 17-member euro zone are threatening to tear the single currency apart.
Producer price inflation slowed in the 12-member euro zone in March, the European statistical office Eurostat said.
New figures show that in the seventeen-member euro zone, G.D.P. has been contracting for six quarters in a row.
Draghi has come under intense pressure over recent months to make cheaper credit available to households and businesses to boost growth in the 18-member currency zone.
Unemployment in the 12-member euro zone stayed at 8.8percentt in May, the third month in a row, the European statistics office, Eurostat, said.
