I understand it, but believe it to be morally wrong to allow immigration only if it benefits the country. After South Vietnam was conquered by the Communist North, many refugees succeed in escaping. Canada took in many of them—out of compassion, not out of expected benefits.
My wife and I, and two of my nephews and their wives sponsored a succession of refugees who lived in a trailer on my property. The first family we sponsored consisted of the Father who had been an electro-chemical engineer, his wife who had been a pharmacist, and their three sons who were at the top of their classes at the local school, though English was not their primary language. This couple was always trying to save us money. One day, I found Van (pronounced “Vang”) in the field in front of the trailer. He had spread a cloth over four uprights, and had placed potatoes cut in the shape of French fries onto the cloth. I asked him what he was doing. He said, “Drying these potatoes in the sun. I want to make French fries.” I asked him, “Why don’t you just place them in boiling oil to cook them?” His reply: “Save electricity.”
Van was a leader. He had been selected to take charge of a large number of refugees prior to arriving in Canada. Just the kind of people the Communists wanted to eliminate. Finally, they moved to Vancouver. I wept when they left.
Doubtless many of the Vietnamese, especially people such as this family, came to be a great asset to Canada. However, that is but a consequent of assisting them—not a reason for assisting them.
I really don’t know, the correct term - that applies here… 
