Border opening can either be harmful or be helpful to a country, it works vice versa. It can be harmful in the sense that bad goods and services can be brought in,weapons can be smuggled in, illegal migration of non citizens can have quick access to a country when the border officials are corrupt.
It can also be helpful due to the price of goods and services because there will be competition in the market place there by making goods cheaper, it also strengthen international relationship.
Opening a country's borders often has negative implications. As the country is currently riddled with corruption the number of illegal activities will increase. But protection will be maintained if government controls are in place. There is freedom to travel between many areas as if you were traveling internally. There are no border checkpoints at the borders of the Schengen area. Also flights in the Schengen area are treated as if they are domestic flights you do not clear immigration upon arrival.