Opening the Black Box: The Internal Labor Markets of Company X

This paper sets out to analyze an internal data set on a Taiwanese auto dealer employing three distinct types of workers. The effects of jobs and levels are positive on both the salary and bonus equations, albeit smaller under a fixed effects than under OLS; however, when factoring in individual fixed effects, the reductions in the bonus equations are greater than those in the salary equations. With changing economic conditions, any consequent variations are greater in bonuses than in salaries, with the most extreme variations being felt by higher ranking employees than lower-level workers. Promotion premiums between levels are smaller than the average differences in pay, and although wage variations do exist within and between levels, the greater effect is on bonuses rather than salaries. The variations in both salaries and bonuses, defined by the coeffficient variations, are also greater in those years when demand is high, as opposed to years of low demand. Entry and exit behavior is observed at all levels, although it is more likely to occur among the lower levels of the hierarchy. Finally, we present strong evidence in support of the cohort effect. Overall, our findings confirm the prevalence of internal labor market (ILM) theories.