Why there is a need Need of foreign exchage market and what are it's advantages?

The need for a foreign exchange market is illustrated greatest by a country's need for the expansion of its infrastructure. Whenever mass physical labor rears its ugly head someone needs to step up to the plate and build that road, dam, ferris wheel, or statue of a car crash. As we all know countries own citizenry usually frowns upon doing this labor itself, as the wages the country would pay are so low for the relative work done that they are better off leeching off welfare. Thus, the need to import foreigners for slave labor is born. By putting in "bids" such as weakening border patrols along borders with certain poorer nations they can essentially create a job market, the poorer country cuts off its welfare policies driving its citizenry across the border into the more wealthy nation where they are forced to take up the poorly paying jobs in order to survive. In return, not only does the poor country lose its resource drains, but, receives substantial "aid" from the wealthy country which on face is to feed its citizenry, but, is usually used to buy the nation's congress a new fleet of gold plated BMWs.

The advantages of this are obvious. First, countries are able to expand their infrastructure with a cheap expendable workforce which, when finished, they can deport as being illegal and not worry about paying welfare for when they have children in future generations, and allows poorer nation to ship money from the minimal paying jobs back in order to purchase goods from the wealthy nation thus insuring a stable symbiotic relationship insuring the new world order's ability to protect us all from the most eminent threat of the future, zombies.