This is a bad arguement. The major costs in life - housing, transportation, and food - are much, much cheaper in the Third World than in the US. One could live like royalty in most of the world at a wage level that would be poverty-starvation in the US. $50K per year is a barely adeqaute middle-class salary in the US for a man providing for a large family. $50K in India or the Philippines or Kenya or Peru would buy you an opulent home, servants, a chauffer, fine dining, etc.
US food is especially expensive because of many people's insistence on eating processed foods versus making their own (compare the cost of some oat cereal per pound versus raw oatmeal) or eating simpler food lower down the processing chain (i.e. salted peanuts in the shell vs. shelled honey-roasted peanuts). Of course no one has time to make their own anymore because so many wives are now working instead of staying home and providing for their families subsistence.
God provides- that is the point. We have to believe in his divine providence. The pay is also better here. Our poor are far better off than the poor of Latin America.Poverty is a terrible thing but the poverty of Africa and some parts of Latin America is starvation.