pulled out of stocks in corporations and put trillions of dollars into commodities - energy, materials and grain futures. It's the futures market that is driving up the prices. biofuels play a paart but a relatively small part. Consider the faact that wheat has gone up as much as corn, but nobody is making biofuels out of wheat(wheat has been affected by bad weather conditions in the Ukraine and Australia).. Of course, there is the argument made that farmers got out of other grains to grow corn. that is to some extent true but from 2006 to 2007 (when the big increase in corn acreage occurred) heat acreage went up about 5% and wheat harvested went up about 10%. One crop that did lose to corn (and wheat) was soy beans - but that isn't a major food item in the U.S. (in japan, yeah).
The demand for crops for biofuels just isn't big enough to cause this much of a price rise. It's because the economy is going down the tubes (thsi became pretty apparent to money managers as of last fall, but more and moreso as we got into 2008) this made them get out of stocks and into commodities.
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x146583"What we normally have is a predictable group of sellers and buyers—mainly farmers and silo operators," he says. But the landscape has changed since the influx of large index funds. Fund managers seek to maximize their profits using futures contracts, and prices, says Warner, "keep climbing up and up."
He's calculated that financial investors now hold the rights to two complete annual harvests of a type of grain traded in Chicago called "soft red winter wheat."
link to businessweek article:
http://www.businessweek.com/globalbiz/content/apr2008/gb20080423_366709_page_2.htm