I posted this in another thread about oil but it is really about food:
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For a couple of years it's been plain to me that investors moved from tanking real estate to commodities inducing the big runups in '07 and '08 in everything from food to metals - and oil. This guy puts the story together well (sorry for the long snip but the story is worth a read):
Johann Hari: How Goldman gambled on starvation$this->bbcode_second_pass_quote('', 'I')t starts with an apparent mystery. At the end of 2006, food prices across the world started to rise, suddenly and stratospherically. Within a year, the price of wheat had shot up by 80 per cent, maize by 90 per cent, rice by 320 per cent. In a global jolt of hunger, 200 million people – mostly children – couldn't afford to get food any more, and sank into malnutrition or starvation. There were riots in more than 30 countries, and at least one government was violently overthrown. Then, in spring 2008, prices just as mysteriously fell back to their previous level. Jean Ziegler, the UN Special Rapporteur on the Right to Food, calls it "a silent mass murder", entirely due to "man-made actions."
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For over a century, farmers in wealthy countries have been able to engage in a process where they protect themselves against risk. Farmer Giles can agree in January to sell his crop to a trader in August at a fixed price. If he has a great summer, he'll lose some cash, but if there's a lousy summer or the global price collapses, he'll do well from the deal. When this process was tightly regulated and only companies with a direct interest in the field could get involved, it worked.
Then, through the 1990s, Goldman Sachs and others lobbied hard and the regulations were abolished. Suddenly, these contracts were turned into "derivatives" that could be bought and sold among traders who had nothing to do with agriculture. A market in "food speculation" was born.
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Here's how it happened. In 2006, financial speculators like Goldmans pulled out of the collapsing US real estate market. They reckoned food prices would stay steady or rise while the rest of the economy tanked, so they switched their funds there. Suddenly, the world's frightened investors stampeded on to this ground.
So while the supply and demand of food stayed pretty much the same, the supply and demand for derivatives based on food massively rose – which meant the all-rolled-into-one price shot up, and the starvation began. The bubble only burst in March 2008 when the situation got so bad in the US that the speculators had to slash their spending to cover their losses back home.
So while there are concerns about water soil etc, just like during the potato famine at least as large a contributing factor to starvation is simple greed and the ability of a few computer geeks to move markets.