In 1991, Japanese workers' average tenure with a firm was 10.9 years; in 1991 in the United

Question:

In 1991, Japanese workers' average tenure with a firm was 10.9 years; in 1991 in the United States the average tenure of workers was 6.7 years.
a. What are two possible explanations for these differences?
b. Which system is better?
c. In the mid-1990s, Japan experienced a recession while the United States' economy grew. What effect did this likely have on these ratios?