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Jit Article Summary

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Article Summary 1 – JIT (Just-In-Time)
A study of JIT and firm performance in US manufacturing between 1990 and 2009: a re-examination of Swamidass (2007)

Concerning Performance Models: The purpose of this study was to see JIT performance over US firms from 1990 to 2009. JIT was measured by inventory reduction, which was calculated by the inventory to sales ratio. Bottom Firms inventory grew 10% unexpectedly from 1981 to 1998, while Firms in the top and middle 10% groups, on the other hand, showed significant inventory reduction over the period. The next explanations state that the bottom firms might have stopped their business practices, but not shut down as they have moved their practices to offshore countries and the fact that the United States has lost many manufacturing jobs in the last 30 years proves it. The research found that the average estimates of total inventory/ sales ratios of the bottom 10% performer group showed statistically significant inventory reduction over the span of the 20 years, especially during the 1990s. The effect of JIT on WIP inventory reduction was analyzed. It was tested to see whether the sampled firms were able to achieve any significant reduction in WIP inventory rather than total inventory, since the amount of WIP inventory is always considered as a direct measure of how tightly the JIT manufacturing system is calibrated. The research indicated that the industry has improved its efficiency over time. In summary, the results of WIP inventory reduction indicate that better performing firms operated the JIT system more efficiently, and maintained their WIP inventory lower than poorly performing firms over the span of the 20 years. Thus, it can be concluded that the JIT system is important to inventory reduction, and that the association between inventory reduction and firm performance exists.

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