For a long time now Europe, as other developed countries, is suffering a long process of ageingof it's society. The thing is: any society needs young people coming into the work pool in order to sustain itself. Since people are choosing not to have many children, or not to have them at all, this poses a big problem for those countries facing this reality.
Like I said, this is a problem in many developed countries, but it became a critical issue in Europe, given the rise in xenofobia. Since the biggest european countries are much more resistant to receiving immigrants, an economical problem rises in the horizon: Lack of demand.
The economical dinamics depends on supply meeting demand, where demand is main driving force. Goods and services are produced only because they are demanded. And the main driving force of demand is people. A living person implies a level of demand attached to it's income level and desires. When such a person is well employed and has access to a good level of good and services, he can exercise it's demand, moving the economy.
The thing is: once a society is stabilized, there's no root for economic growth other than populational, with little or no gain in income per capita(ok, there's the gain in productivity, but one could argue that this can cause unemployement). If a country grows 2% in GPD in a given year, but it's income per capita doesn't change, it means that the population of that country also grew 2%. This is basically what's been happening in Europe, more or less. When you see a change in this reality, is because something destabilized the economy. I reckon that the imigrants in Europe(and I suspect the same for USA) helped the economy in the process of becoming richer than they were when they arrived. This is the destabilizing force that could help Europe economy grow. The demand they create would not happen if they stayed in their countries, because it's a result of higher income, which is linked to all the gains provided by european society.
When the average european repels that immigrant and tries to shut down it's frontier, it's setting a date for the day when his country stops to grow, populational and economical wise. It's needed, for the european, to face this reallity, especially in moment of crisis, when the first instinct is to kick the "last to come" out.
Ps.: Before people tear my argument apart, I must say that this is a very superficial comment, based on pure observation and a basic university economical knowledge. Since I finished University 4 years ago, this is very basic indeed. So I ask that any rebuttal is made in a constructive and non-offensive way. My intention is to discuss a subject that I think is very relevant today, especially after the last episodes in France, Italy and Norway.
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