This paper examines the relationships between the structure of internal labor markets and the mobility, experience, and income of workers. The author discusses the taxonomy of the markets and the predicted differential impact of experience. Internal labor markets are classified according to the assumption that structure is related to mobility. In manorial structure, vertical stratification and ports of entry imply that a worker is likely to remain with the firm. In guild structures, which are usually highly unionized, horizontal movement between firms is expected to be high. The open market is unstructured and competitive. Manorial firms provide training specific to the firm. Guild structures usually employ skilled craftsmen whose skills are related to the industry rather than the firm. The unstructured market is characterized by the absence of skills and investment in the employee. Data used in.this study were derived from the Social Security Administration work history file. Equations and graphs were constructed to display the results of the study. pul
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