Since 1980, employment structure by industry and occupation in developed countries has changed greatly. The most significant change is a rise of administrative and professional occupation in the tertiary industry and a fall of other occupations (called "general occupation", hereafter) in the secondary industry. These are structural changes in a sense of irreversible and long term changes. In these two changes, the former has attracted attention as "shift towards service industry" and "deindustrialization", on which many studies have been made. On the other hand, studies of the latter change, which can be called "shift towards administrative and professional occupation", are less especially in the field of economic theory. In Section I of this paper, changes of employment structure in the recent 30 years in developed countries are analyzed quantitatively. According to the most recent data, the employment of general occupation in the secondary industry was reduced to a little over 10% in the total employment. On the other hand, the employment of administrative and professional occupation in the tertiary industry has risen up to mid-30%. It is necessary to clarify reasons and mechanisms of such structural changes. Section II explains two mechanisms that results in structural change of employment by industry; "inter-industry Baumol effect" and "indirect employment effect". The former means that, if the real output growth rate of the secondary industry and that of the tertiary industry are nearly equal, and if the labor productivity growth rate of the secondary industry is larger than that of the tertiary industry, the ratio of the secondary industry to the total employment would decrease, and the ratio of the tertiary industry would increase. Section III explains two mechanisms that results in structural change of employment by occupation; "inter-occupation Baumol effect" and "overseas relocation effect". The former means that, if the growth rate of the quantity of the administrative and professional work and that of the general work are nearly equal, and if the labor productivity growth rate of the latter work is larger than that of the former work, the ratio of the general occupation to the total employment would decrease, and the ratio of the administrative and professional occupation would increase. According to the empirical analysis of Section II and Section III, there are the following two tendencies. Inter-industry Baumol effect tends to act not only in the general occupation, but also in the administrative and professional occupation. Inter-occupation Baumol effect tend to act not only in the secondary industry but also in the tertiary industry. When linking these two trends, the two structural changes referred in the biginning are easily explained. Therefore, the structural change of employment in developed countries in recent 30 years can be understood as a result of these two Baumol effects. Finally, Section IV mentions problems in economic theory in order to analyze employment structure in the contemporary capitalism. Although Marx, in Kapital, defined administrative work as supervision labor, and professional work as complex labor, he abstracted them substantially in the analysis of value formation. As, in the mid-19th century, the administrative and professional occupation existed only in a small percentage, such theoretical abstraction is acceptable. However, in the present, as the ratio of the administrative and professional occupation has reached close to 40%, such abstraction is not tolerated. Braverman, in Labor and Monopoly Capital, overestimated the decomposition of the administrative and professional work by Taylorization. Consequently, he overlooked the rise of administrative and professional occupation. It is necessary to explicitly incorporate the economic role and function
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