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.
Don't you know what's border and it effects when is open and when is close, if border is close in any country they will not be importation and exportation of goods and services and that will result a hardship because the country will be using what they generate in their country and no goods will be coming to the country and any goods that enters the country will pay higher amount of fees to smuggle goods and it will result as high price of commodity because of the money paid in border to let in the goods, border opening will create more advantages to the country because price of goods and services will be cheap