The "Bubble" burst due to over-leveraging plus excess speculation followed by lost financial market and overall economic confidence.
Japan has stagnated economically for 25+ years because of: a) too much government influence (thinking it is doing the "right" thing) squeezes out and limits Japan's private sector capabilities; b) true creativity and entrepreneurship is limited and uneven; c) protected home financial markets led to weakened credit pricing and therefore less efficient capital movements; d) limited restructuring expertise.
One item not mentioned in Post 6 is the fact that the politeness of Japanese culture makes the confrontation of the above issues hard to address.
Post 7 will focus on the important lessons the US can learn from Japan.