新古典增长模型的稳态路径能否包括资本增进型技术进步？

Can the Steady-State Path of Neoclassical Growth Model Embrace Capital-Augmenting Technological Progress?

现有文献认为,除非生产函数是科布—道格拉斯函数,新古典增长模型稳态路径上的技术进步必须是纯劳动增进型而不能包括资本增进型。然而,本文通过一个扩展的拉姆齐模型证明,当投资具有调整成本且调整成本与资本增进型技术水平正相关时,即使生产函数不是科布—道格拉斯函数,新古典增长模型的稳态路径也可以包括资本增进型技术进步。根据本文研究,我们应重新思考新古典增长模型实现稳态增长的条件,以及资本和资本增进型技术进步在经济增长中的作用。

The celebrated Uzawa （ 1961 ） theorem holds that, on the steady - growth path of neoclassical growth model, technological progress must be purely labor - augmenting rather than capital - augmenting, except the special case where the production function takes the form of Cobb - Douglas. With an augmented Ramsey model, however, we prove in this paper that, when investment has adjustment cost which correlates positively with capital- augmenting technology, the steady state growth path can also embrace capital - augmenting technological progress, even if the production function is not Cobb - Douglas. Our conclusions contribute to the study of steady - state condition of neoclassical growth model, and the understanding of the roles of capital and capital -augmenting technology progress in economic growth.