中文摘要：

基于集权与分权理论，采用主成分分析方法测度管理层权利，运用个体随机效应模型、固定效应模型和极大似然随机效应模型等回归分析方法，探讨管理层权利、过度投资与公司价值的关系，研究发现管理层权利与过度投资呈现U型曲线关系，过度投资降低了公司价值；在U型右侧曲线上，管理层权利对过度投资与公司价值之间的负向关系具有正向调节效应，在U型左侧曲线上，管理层权利的调节效应并不明显。

英文摘要：

Based on the theory of centralization and decentralization, using principal component analysis method to measure managerial power, and three regression analysis methods which includes GLS random-effects model, Fixed-effects model and Maximum-likelihood Random-effects model, this paper analyzes the relationships between managerial power, over-investment and corporate value. The empirical results reveal that there is U-curve relationship between managerial power and over- investment; over-investment induces corporate value, and managerial power has a positive moderating effect on the negative relationship between the over-investment and corporate value in the right side of the U-shaped curve. However, the moderating effect of managerial power is not significant in the left side of the U-shaped curve.