Influences of agricultural technology on the size and importance of food price variability / Julian M. Alston, William J. Martin, and Philip G. Pardey ; comment: James M. MacDonald -- Corn production shocks in 2012 and beyond : implications for harvest volatility / Steven T. Berry, Michael J. Roberts, and Wolfram Schlenker ; comment: Derek Headey -- Biofuels, binding constraints and agricultural commodity price volatility / Philip Abbott ; comment: Brian D. Wright -- The evolving relationships between agricultural and energy commodity prices : a shifting-mean vector autoregressive analysis / Walter Enders and Matthew T. Holt ; comment: Barry K. Goodwin -- Bubble troubles? : rational storage, mean reversion and runs in commodity prices / Eugenio S.A. Bobenrieth, Juan R.A. Bobenrieth, and Brian D. Wright ; comment: Jock R. Anderson -- Bubbles, food prices, and speculation : evidence from the CFTC's daily large trader data files / Nicole M. Aulerich, Scott H. Irwin and Philip Garcia ; comment: Aaron Smith -- Food price volatility and domestic stabilization policies in developing countries / Christophe Gouel ; comment: Shenggen Fan -- Food price spikes, price insulation, and poverty / Kym Anderson, Maros Ivanic, and William J. Martin ; comment: Marc F. Bellemare -- Trade insulation as social protection / Quy-Toan Do, Andrei A. Levchenko, and Martin Ravallion ; comment: Ron Trostle.