It is primarily due to how they made their system. They actually modeled it after our system of many states being part of a nation. Then they gave it one currency and introduced socialism. Now this has led to them having a collapse in Greece and Italy due to them being the weaker countries. Since those citizens are asking for more for less and expecting more then the other citizens and all the countries have different policies for retirement, money is being given out unevenly. Now since we have universal ages and roughly equal minimum wage we do not run into this problem at all or very infrequently. Now they are collapsing since the stronger countries are having to bail out the weaker ones and results in all of them being weakened. This cycle will continue and will. A painful collapse of Europes economy unless they do something.