Expectative of work of immigrants in Chile

Currently in Chile the percentage of migrants from the rest of Latin-American who search for a job and better life conditions it is very high. It is normal to find an immigrant in the bus or subway selling chocolates or other candies or that they’re working in a job with a poor rent so what kind of work they’re look? Why? Probably it’s a deeper problem like a racial discrimination and it’s necessary to stop and find solutions for this matter.