优化营商环境降低了微观主体投资调整成本,改变了宏观经济政策运行的微观环境。构建具有微观基础的宏观NKQ-DSGE(New Keynesian with Tobin s Q-Dynamic Stochastic General Equilibrium)模型,研究“营商环境优化”对“财政政策提效”...优化营商环境降低了微观主体投资调整成本,改变了宏观经济政策运行的微观环境。构建具有微观基础的宏观NKQ-DSGE(New Keynesian with Tobin s Q-Dynamic Stochastic General Equilibrium)模型,研究“营商环境优化”对“财政政策提效”的影响。研究发现:优化营商环境会降低投资调整成本,从而增强政策的托宾Q效应,但对积极财政政策而言是一把双刃剑;对于财政支出政策和降低消费税政策,优化营商环境会加剧政策对私人投资的挤出效应,从而降低政策乘数和弱化政策效果;对于降低资本税政策和降低劳动税政策,优化营商环境会提升政策对私人投资的促进效应,从而提高政策乘数和强化政策效果。因此,应偏向于使用乘数较大的政策工具,同时政策工具之间应协调配合,实现财政政策从“加力”向“提效”转型。展开更多
The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique...The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique where the Liouville space is briefly expanded with an additional (virtual) space only within ultrashort subintervals. This tremendously reduces the cost of time-consuming calculations. We implement our technique for an example of a charged particle in both harmonic and anharmonic potentials. The temporal evolutions of the probability for the particle being in the ground state are obtained numerically and compared to the analytical solutions. We further discuss the physics insight of this technique based on a thought-experiment. Successive processes intrinsically “hitchhiking” via virtual space in discrete ultrashort time duration, are the hallmark of our technique. We believe that this technique has potential for solving numerous problems which often pose a challenge when using the traditional approach based on time-ordered exponentials.展开更多
In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order t...In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order to prove the main results,we first give some bidirectional estimates for several typical integrals.展开更多
文摘优化营商环境降低了微观主体投资调整成本,改变了宏观经济政策运行的微观环境。构建具有微观基础的宏观NKQ-DSGE(New Keynesian with Tobin s Q-Dynamic Stochastic General Equilibrium)模型,研究“营商环境优化”对“财政政策提效”的影响。研究发现:优化营商环境会降低投资调整成本,从而增强政策的托宾Q效应,但对积极财政政策而言是一把双刃剑;对于财政支出政策和降低消费税政策,优化营商环境会加剧政策对私人投资的挤出效应,从而降低政策乘数和弱化政策效果;对于降低资本税政策和降低劳动税政策,优化营商环境会提升政策对私人投资的促进效应,从而提高政策乘数和强化政策效果。因此,应偏向于使用乘数较大的政策工具,同时政策工具之间应协调配合,实现财政政策从“加力”向“提效”转型。
文摘The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique where the Liouville space is briefly expanded with an additional (virtual) space only within ultrashort subintervals. This tremendously reduces the cost of time-consuming calculations. We implement our technique for an example of a charged particle in both harmonic and anharmonic potentials. The temporal evolutions of the probability for the particle being in the ground state are obtained numerically and compared to the analytical solutions. We further discuss the physics insight of this technique based on a thought-experiment. Successive processes intrinsically “hitchhiking” via virtual space in discrete ultrashort time duration, are the hallmark of our technique. We believe that this technique has potential for solving numerous problems which often pose a challenge when using the traditional approach based on time-ordered exponentials.
基金supported by the Natural Science Foundation of Hunan Province of China(2022JJ30369)the Education Department Important Foundation of Hunan Province in China(23A0095)。
文摘In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order to prove the main results,we first give some bidirectional estimates for several typical integrals.
