For a regularly running labour market and optimization of both employer and employees' expectations, the realization of labour mobilization, at least theoretically, is a desired situation. Mobilization of labour enables both sides to maximize their benefits; for this, not only should it be realized within national boundaries but it is also expected to be recognized internationally. Yet, the practice does not comply with that theoretical assumption as illustrated by the excessive labour migration from underdeveloped countries to the developed countries of Northern and Western Europe during the 1960s. It was initially assumed, that this movement of labour which was carried out under the supervision of governments, would satisfy the labour demands of the developed countries by tapping the excess available in developing countries. Furthermore, it was thought that developing countries could get rid of their unemployment problems that a labour excess would lead to, and accomplish a balance of payment in this way; even more, it would decrease the gap between developed and underdeveloped countries.