Economists have pointed out that Iowa has become overbuilt with corn ethanol plants. When the price of oil dropped, ethanol plants went idle, and some went bankrupt. For now, new corn ethanol plants are not being built. But if oil prices spike again, corn ethanol fever may set in again. I am not saying we should outlaw building new corn ethanol plants, just that we should stop using public money to do that. If we have public money to invest, we would be better off to invest it in research and technology development for next-generation biofuels.