More squabbles over grain prices

Argentine grain farmers are on strike over the price they can get for their product.  Read a news story about it here.  The Argentine government wants to keep domestic food prices low (this is a country that has been hit by bouts of by crippling hyper inflation a few times in its history).  They are doing this by limiting the ability of grain farmers to export their product (thus increasing the domestic supply).  Understandably this doesn't sit too well with farmers who would like to take full advantage of the rising global price for grain.  This type of dispute is probably as old as there have been farmers, costumers, and governments.  But it is taking place in the context of seemingly increasing concerns about global food prices.  It is also a good example of a classic conundrum.  If you were in charge how would you go about trying to assure that people in your country have access to affordable food?  Make sure your farmers are happy and profitable?