Actually there is at least one plastic that does fairly well cost-wise vs other plastics and is made out of typically corn in the US, PLA [1]. The main reason

Actually there is at least one plastic that does fairly well cost-wise vs other plastics and is made out of typically corn in the US, PLA [1]. The main reason that it doesn't get used more is that it's properties don't make it ideal for a number of other cases where you need better impact resistance or heat resistance. A number of the plastic cups out there these days are made of the stuff. [1] http://en.wikipedia.org/wiki/Polylactic_acid http://en.wikipedia.org/wiki/Polylactic_acid