Covariance breakdowns and connectedness of crude oil futures markets with non-synchronous data

ABSTRACT

This article identifies the breakdowns in the covariance of three benchmark crude oil futures markets (WTI, Brent and Dubai) and investigates the changes of market connectedness across the breakdown periods. As the crude oil futures are traded in different regions, this article eliminates the non-synchronous trading data by employing the Vector Moving Average structure and the Bayesian data augmentation approach, which keeps the integrity of original data without changing its properties. The results show that there are significant breaks in the covariance structure of crude oil futures markets. The breakdown periods are consistent with the periods when the market volatilities are at high level and the returns are volatile. The changes of market connectedness are independent of the covariance states, which supports the globalization hypothesis for the crude oil market. The results also suggest that there is more information flow out of the WTI than to the WTI during the sample period, particularly during the breakdown periods in 2008–2009.     

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本文放松了理性经济人假设,在行为经济学双曲线贴现模型框架下,以"自我控制"认知偏差及相应的模型参数设定对东西方消费文化差异进行了技术表达,进而阐明了消费过度(欧美国家)和消费不足(东亚国家)这两类消费行为偏差的形成机制。本文采用全球48个国家和地区1978—2007年的面板数据,以儒家虚拟变量和性生活指数作为消费文化的替代变量检验了文化与消费的关系。结果表明,在解释东西方消费率差异时,预防性储蓄等传统理论的解释力远低于不可观测的国家个体效应。儒家虚拟变量和性生活指数能分别解释国家个体效应的28%和58%。这表明消费文化等不随时间改变的个体因素比传统变量更能解释各国居民的消费差异。实践层面上,双曲线贴现模型中锁定技术能有效纠正"自我控制"认知偏差,从而消解儒家文化对消费的深度抑制,可为扩大内需政策创新提供思路启发和技术支撑。     

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