period. While energy (mostly petroleum when talking about farm produce) was a larger proportion of ALL food products. So, ethanol put's pressure on corn prices (a fraction of the total farm output) but ehtnaol also reduces petroleum prices which impacts a larger fraction of the cost of producing ALL farm produce.
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2009/04/09/BUHL1704UL.DTL"..Thursday's report from the Congressional Budget Office gives some ammunition to each side.
Researchers found that
ethanol production was responsible for 10 to 15 percent of the increase in food prices between April 2007 and April 2008. As new ethanol biorefineries opened across the country, corn prices rose, causing a wave of price increases for everything from corn-syrup sweeteners to meat from animals fed with corn.
But ethanol production wasn't the only culprit.
Between
22 and 36 percent of the overall increase in food prices can be traced to the rising cost of traditional energy sources such as gasoline, diesel and electricity, according to the report. Virtually every step of food production - from planting to transportation to processing - consumes fuel or electricity. The period covered by the report also saw record-breaking oil and gasoline prices."
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The increase in ethanol production was HUGE in 2007-2008 meaning a big increase in it's demand for corn. But, in 2009-2010 (and likewise from 2010-2011) the increase in ethanol production wasn't nearly as much as back in 2007-2008 timeframe so the impact on corn prices is much less. But now ethanol represents a bigger part of the fuel supply .. abaout 9.6% ... and this does impact gas prices significantly (see OP).
Since petroleum is such a significant part of the cost of producing so much of our food, ethanol has the affect of lowerinng the price of ALL farm commodities .. NOT JUST CORN. So the net effect is a just about a 'wash' (actually it's quite possible ethanol's net effect is to reduce the price of food items over-all).
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=115x193027 http://www.democraticunderground.com/discuss/duboard.php?az=show_topic&forum=115&topic_id=194230