“oh by the way, #2 yellow corn isn’t used for human food anyway.”
That would be news to some that I found on google in 20 seconds.
http://www.allproducts.com/manufacture99/ksvtrading/product3.html
Come up with better facts.
The US doesn't import corn from South Africa, but, in any event, "Corn fit for human consumption" is not co-mingled with corn sold as ethanol feedstock.
Maybe 10-12% of the US corn crop is consumed in some form by humans, the vast majority of this is in the form of high-fructose corn syrup, with a minor portion in the form of food such as corn chips, tortillas or canned corn. Almost of of this corn is "white" vs. "yellow" corn. Corn intended to be used as human food in the US is grown on direct contract with the food processor because of quality control, genetic and other concerns.