I agree about immigration, but the world has a large amount of very fertile land in places with very high costs of living. Bringing in large numbers of new immigrants at ultra low pay will have big consequences in most high-cost countries. It's worked well in the US, but that's because of our (former) identity as a nation of immigrants and the massive overlap between US and Latin American culture. In other nations, the outcome could very well be a racially/culturally incompatible underclass working the lowest paying and least consistent jobs, with little-to-no chance of fully integrating.