@inbook{NBERc12806,
 Crossref = "NBERchav12-1",
 title = "Corn Production Shocks in 2012 and Beyond: Implications for Food Price Volatility",
 author = "Steven T. Berry and Michael J. Roberts and Wolfram Schlenker",
 BookTitle = "The Economics of Food Price Volatility",
 Publisher = "University of Chicago Press",
 year = "2012",
 month = "September",
 URL = "http://www.nber.org/chapters/c12806",
}
@book{NBERchav12-1,
 title = "The Economics of Food Price Volatility",
 author = "Jean-Paul Chavas and David Hummels and Brian Wright",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2013",
 URL = "http://www.nber.org/books/chav12-1",
}