标题： 在理性不注意框架中的变分优化的解 显示英文标题

标题： On the solution of the variational optimisation in the rational inattention framework

摘要： 我分析了Christopher A. Sims在理性不关注框架中提出的变分优化问题的解法。 一般来说，该解不存在，尽管在某些特殊情况下可能存在。 我证明了对于Sims（2003，2006）分析的二次和对数目标函数，解不存在。 对于线性二次目标函数，在对其除一个参数以外的所有参数进行限制的情况下，可以构造出解。 因此，这种方法不太可能适用于更广泛的经济模型。 显示英文摘要

摘要： I analyse the solution method for the variational optimisation problem in the rational inattention framework proposed by Christopher A. Sims. The solution, in general, does not exist, although it may exist in exceptional cases. I show that the solution does not exist for the quadratic and the logarithmic objective functions analysed by Sims (2003, 2006). For a linear-quadratic objective function a solution can be constructed under restrictions on all but one of its parameters. This approach is, therefore, unlikely to be applicable to a wider set of economic models.