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This paper considers the macroeconomics of the oil price for the United States. It investigates the impact of large oil price hikes in a standard VAR framework by introducing a new Markov switching based oil price specification. The explanatory power of this new specification is compared to that of a number of prominent non-linear specifications. The key findings are: (1) the new oil price specification is appropriate in both empirical and theoretical terms and allows for a well-founded distinction between "large" and "normal" oil price increases. (2) The observed impact of oil price shocks on real GDP growth is largely attributable to no fewer than three large oil price increases, namely those of 1973-74, 1979 and 1991, while variables such as consumer and import prices are also affected by normal oil price increases. [ABSTRACT FROM AUTHOR]

This perspective paper reviews and critiques the policy analysis and modeling of future natural gas markets in the National Petroleum Council's 2003 natural gas study (NPC Study). The NPC Study provided an important and timely review of long-term natural gas supply, demand and potential policies to increase supply or suppress demand. However, its long-term scenarios used assumptions and .simplifications that led to understating likely longer-term market reactions to higher natural gas prices, which results in exaggeration of the potential benefits of the policies recommended by the NPC. In addition, the narrow scope of the NPC Study did not address many important considerations in natural gas policy, such as the costs of recommended policies, or their impacts on taxpayers, resource owners, or the environment. Overall, the study does not provide the evidence needed to justify major natural gas policies, especially in view of the current uncertain market environment. [ABSTRACT FROM AUTHOR]