The world watched in horror as the November 13 terrorist attacks on Paris showed the City of Light in a dark place, leaving 130 people dead and forcing the French government to impose a national state of emergency.

As fear rippled across Europe, not only did countries heighten their security levels, but governments examined their current open-border policy under a microscope, an issue that was already being dissected in the face of the worst migration crisis since World War II.

Though reimposing borders has clear advantages for the continent’s security, such a move greatly affect Europe’s economy. Open borders are conducive for trade and tourism; passport checks and border guards are not. Re-imposing borders means longer lines, traffic jams, and fewer travelers and goods moving throughout the different countries.

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Photo Credit: Belgian Army soldiers patrol outside EU headquarters in Brussels after a city-wide lockdown was imposed. Virginia Mayo / Associated Press