基于VAR模型的QE政策下人民币汇率传导机制研究

针对美国实施的量化宽松货币政策,基于Frankel理论,通过建立VAR模型实证分析货币政策的汇率传导机制.研究发现:在美国四轮(2008-2014)QE国际环境下,从长期看,相对货币供给、利差、通货膨胀差、相对真实收入和人民币汇率具有一定长期均衡关系,但单个变量对汇率的影响并不显著,货币政策并不具有汇率有效传导机制;从短期看,上述长期均衡关系是汇率变化的重要因素,汇率的短期波动在很大程度上来自于系统对偏离这种长期均衡的修复,汇率的即期波动也受其自身、货币供给及真实收入的影响,且短期传导机制具有一定滞后性,其中货币供给效应滞后2个月;从中短期看,汇率变化除受到很强的自身相关性影响外,也受相对真实收入、相对利率冲击的影响,且影响滞后持久、深远(至少10个月),具有显著的汇率理论传导效应.据此提出了相关建议.     

The structure of the spherical tensor forces in the USD and GXPF1A shell model Hamiltonians

The realistic shell model Hamiltonians, USD and GXPF1A, have been transformed from the particle-particle (normal) representation to the particle-hole representation (multipole-multipole) by using the known formulation in Ref. [1]. The obtained multipole-multipole terms were compared with the known spherical tensor forces, including the coupled ones. It is the first time the contributions of the coupled tensor forces to the shell model Hamiltonian have been investigated. It has been shown that some coupled-tensor forces, such as r²Y₂σ]¹, also give important contributions to the shell model Hamiltonian.