The provided graph illustrates the average time spent by four different manufacturers to produce vehicles at their United States factories.
Overall, all four manufacturers showed a general downward trend in production time over the period. General Motors recorded the most significant decline, while Ford followed a different pattern, rising before eventually decreasing. By 2005, four companies had converged to a similar level of approximately 20 hours.
Regarding two US manufacturers, in 1998, General Motors took 32 hours to produce the car, 4 hours more than the production time of Ford. After that, General Motors witnessed a substantial decline to approximately 22 hours over the 7 years. In contrast, the production time of Ford surged and reached a peak of 31 hours in 2001 before falling by around 10 hours to just over 20 hours in 2005. This meant that by 2005, Ford and General Motors had reached virtually the same production time, despite starting at very different levels in 1998.
As for the remaining companies, in 1998, both manufacturers needed at least 22 hours to finish the car. The figure for Toyota showed fluctuation between 22 and 24 hours, followed by a gradual decrease to 20 hours by 2005. Likewise, despite a drop of 2 hours of Honda in 1999, Honda recovered to reach a peak of 24 hours in 2002, before falling back to 20 hours at the end of the period.