What is the skill level of the migrants?
Do the host countries need low-skilled jobs or high-skilled jobs?
Above all how many jobs in various categories are there in the host country for which the host population cannot supply workers? Because the tide of people just keep coming and small countries simply cannot cope.
Not really a problem since we have free education in Sweden. You can just go to school until you're qualified for a job. We even pay students a salary for studying.
Historically, in the IT industry, when refugees come here they often, eventually, travel back to their home countries and set up shop over there. Their contacts with Sweden serves them well and we get outsourcing deals set up. This is often framed as a negative for the richer economy. But it isn't. It is actually beneficial for both countries. Everybody wins. A good example is India. Not that we have seen any Indian refugees. But we have seen plenty of economic Indian migrants who often settle back in India. I have a lot of experience working with such Indians.