What factors really drive Japanese to save 20 percent of their income?

By the time Allied economic missions took the reins of Japan’s economy into their own hands, Japan had already begun to establish trends indicative of the stabilization, increased productivity, and growth the missions were sent to provide. Furthermore, when these missions attempted to alter Japan’s economic strategies, officials in the Ministry of Finance clung to most of the economic adaptations they had already made.
The Japanese achieved economicsuccess on their own terms,terms that were grounded in traditions handed down to them by their ancestors.
This fact is undeniable, and it should not be ignored.