Thanks for the graphs, Tyler, very interesting. 'The Lost Decade' is a tagline just like 'Dutch Disease', The Washington Consensus' or 'das deutsche Wirtschaftswunder'. They tend to obscure as much as they illimuninate. Sometimes they can be downright misleading or evolve to mean something completely different.
Since the busting of their property bubble Japan has suffered through almost twenty years of low, slow, no growth, and three going on four official recessions. As you point out the Nikkei is about one-third of its prior level, and property prices declined by over 50% leaving residents with 50-year mortgages. In comparison what is happening in America at the moment is recession-lite. Wait till the real pain begins.
What little growth Japan has had has been mainly export-lead, and exports do not generate the same level of GDP growth as domestic consumption, so living standards in Japan have stagnated. You can argue whether they stagnated at a very high level compared to other nations or not, but they have not been going up. Meanwhile, government spending has left Japan with the highest debt per GDP of any developed country.
Low unemployment is a poor measure of productivity when used alone. If I hire everyone to sweep the streets using straw brooms they are not unemployed, but they are also not productive. Countries like Germany have both very high unemployment, but also very high levels of labor productivity per worker.
Japan's old employment for life policies meant many unproductive workers were simply kept on, but they stopped producing anything of value. Even if in nominal terms productivity goes up in aggregate that still means that those unproductive workers are mainly putting in face time versus creating anything of value. While firms that kept on older, less productive workers were also not able to absorb newer, younger workers entering the workforce either. So youth unemployment and critically under-employment means that generation never got a chance to grow and develop either.
Why Japan keeps failing
America is having its own Japan Moment. Basically, it has been accruing current account deficits for the past thirty some years. That is a net wealth transfer from the domestic US economy to the rest of the world year in and year out. It would easily take at least fifteen years and a lot of pain before that deficit could be brought down to more managable levels much less eliminated. But America is no Turkey with an average age of 15-years old where the government can count on those teenagers entering the workforce in the next 15-years and contributing to economic growth. Instead America faces the prospect of 75-million Baby Boomers leaving the workforce (full-time) and entering retirement. That will be a further drain on public resources to pay those pensions and healthcare benefits.
I do not doubt that America has a dynamic economy. It is not as structurally rigid as Japan's was/is. The third largest country in the world with a social democracy, market economy and 300 million consumers is bound to create wealth, and lots of it. But no matter how much wealth they created already they have not been living within their means either. That simply means that they need an equivalent amount of future growth just to pay for past consumption. That's just treading water not moving forward! ; - )
The organized state is a wonderful invention whereby everyone can live at someone else's expense.