1. King Abdullah Petroleum Studies and Research Center, Riyadh, Saudi Arabia; and Fox School of Business, Temple University, Philadelphia, Pennsylvania 19103
2. King Abdullah Petroleum Studies and Research Center, Riyadh, Saudi Arabia
3. King Abdullah Petroleum Studies and Research Center, Riyadh, Saudi Arabia; and Center for Operations Research and Econometrics (CORE), Université Catholique de Louvain, Louvain la Neuve, Belgium B-1348