Source: CIA The World FactbookIt is evident that the EU's social system is running into severe problems. Few people are supposed to take over the load of the immense number of old people in 20 to 40 years from now.
Taking over does not only mean paying them by tax but also buy their wealth. I.e. Severe price crashes in every sector can be foreseen if the north does not allow southern people to step in. E.g. Pension funds are going to liquidate their assets for allowances being asked for by a growing number of retired people. Also those people are going to liquidate their private assets. Shares, bonds, real estate, precious metals are going to crash.