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After the Kaldor’s Stylized Facts:A Theory of the Labor Share’s Fall

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After the Kaldor s Stylized Facts:A Theory of the Labor Share s Fall

著者 TAKAHASHI Harutaka

journal or

publication title

明治学院大学産業経済研究所研究所年報 = The Bulletin of Institute for Research in Business and Economics Meiji Gakuin University

volume 35

page range 1‑6

year 2018‑12‑25

URL http://hdl.handle.net/10723/00003516

(2)

1 After the Kaldorʼs Stylized Facts

共同研究 1  資本理論ベースの多部門最適成長理論の構築

After the Kaldorʼs Stylized Facts:

A Theory of the Labor Shareʼs Fall

Harutaka Takahashi

1 .Introduction

Over last several years, we have witnessed the increasing number of research that indicate  the decline of the labor share. This phenomenon has been clearly confirmed by Autor et al. 

(2017). One of their important findings is that “a fall in the labor share will be driven largely  by between-firm reallocation rather than a fall in the unweighted mean labor share within  firms.” In order to explain this fact, they have presented the superstar-firm theory; since the  most productive firms with a low share of labor become increasingly dominate industry, the  aggregated labor share will tend to fall. Although their theory clearly has many aspects of  dynamics, it is totally analyzed in the frame of statics. We definitely need a dynamic model for  a theoretical explanation of the phenomenon.

However, we cannot apply the macro-dynamic models used in many macro growth research,  because they are mainly built for focusing on the “Kaldor facts” and firmly based on the Solow  growth model. Since the core of the Kaldor facts is now empirically refuted, we definitely need  an alternative dynamic model to explain the new phenomenon.

I would like to propose here a multisector optimal growth model as the model for giving  a firm theoretical base of the superstar-firm theory. The multisector optimal growth models  were intensively studied in 1970s and 1980s by L. McKenzie, among others, under the title of  Turnpike Theory. Furthermore, based on Turnpike Theory, Takahashi (1985) has established  the existence and global stability of the optimal stationary path in the multisector optimal  growth model with one-pure consumption good and n goods sectors. I will briefly explain how  this approach could be applicable to the superstar-firm theory below.

2 .The Model and Assumptions

We start from the following neoclassical multisector optimal growth model with a sector  specific TFP term (in other words, the sector specific Hicks neutral technical progress). The 

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