Demand-driven migration systems are those in which a third-country national must have a job and the initiative should be started from the employer's side. The employer must make an application for a future worker to the immigration authorities for the right of residence and work permit. Generally, this worker must go through an employment test and also need to meet certain criteria like minimum salary, minimum education, and working conditions. Highly skilled workers who already have a job offer can bring their family members with them.
Supply driven migration system refers to the system in which a country shows its interest to welcome potential high skilled workers without a job offer. But generally, there is a limit or there is a quota system in this supply-based migration. Candidates generally get points on basis of their age, language proficiency, qualifications, work experience, presence of the family members, and some extra points if the candidate holds a job offer. This is also called a point-based system. For all these parameters, a candidate will get certain points and certain minimum points need to be achieved to get qualified for admission. In this system, the applicant will receive direct permanent residence upon entry and can come with the family.
In both the schemes, migrants have been given the right of permanent residence and can come along with their families with the intention of settlement. Many people arrive without a job, with little knowledge about the host country, job market, and the language is spoken in the host country. It becomes difficult for such migrants to get a job in the job market due to the lack of knowledge of the job market in the host country. Additionally, a migrant can have his education and work experience from the country about which the employer can have limited knowledge. Generally, the majority of the countries used a combination of both points-based and application-based migration regimes to attract high skilled workers.