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Introduction
The chart illustrates the number of hours required to manufacture a vehicle by four US-based car companies — Nissan, Daimler Chrysler (DC), General Motors (GM), and Ford — from 1998 to 2002.
Overview

Overall, the time needed to produce a vehicle generally decreased for all manufacturers over the period. Nissan consistently had the shortest production time, while Daimler Chrysler often required the longest. Ford showed the most significant improvement in reducing production time.

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In 1998, Daimler Chrysler took the longest time to produce a vehicle, requiring around 36 hours. General Motors and Ford also had high production times, approximately 32 and 30 hours respectively. In contrast, Nissan had the lowest production time at just over 24 hours. Between 1998 and 2000, all manufacturers except GM showed noticeable reductions in manufacturing time. Ford’s production time dropped dramatically from about 30 hours to around 23 hours, matching Nissan by 2000.

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From 2000 to 2002, the trends continued. Nissan maintained its lead, slightly decreasing its time to just under 23 hours in 2002. Ford continued to improve, reducing its time to around 22 hours by 2002, becoming the most efficient producer. Meanwhile, GM and DC remained relatively stable, with GM maintaining a steady line around 30 hours and DC fluctuating slightly but ending near 32 hours in 2002.
Conclusion

In conclusion, Nissan and Ford became the most time-efficient manufacturers by 2002, while Daimler Chrysler and GM continued to lag behind in vehicle production efficiency.