That's a vast over simplification. Population density does not automatically equate to economic growth. One could use many countries as example, but the U.S exemplifies this. Over 47 million on food stamps, 50% of the population on some form of social assistance and a job participation rate at its lowest since 1978. Will adding more population lead to growth? Not likely. It will strain the economy further in an ever growing welfare state. Demand for certain resources and consumer goods tend to fall off when people don't have jobs and have less disposable income. Nothing to do with population.
So to correct my obvious generalization, you frame a response to a country that falls completely outside of relevance of what is being talked about.
It's absurd how any global event american's will twist to revolve around their domestic politics.
Of course it's not automatic growth, however it was used as justification for raising commodities through the roof.
Anyway america still is just as concerned about the global market, immigration is crucial part of industrialized economies as long as we want to have some form of retirement.
