The Japanese economy does seem to have suffered from very bad mismanagement, the two most serious cock-ups being "quantative easing" (printing money and hoping that nobody would notice) on a grand scale and a massive sales tax (similar to our own VAT) which has crippled domestic sales.
All this of course on top of zero growth and deflation, for years, which makes debt management impossible...
They may of course reverse their decline by getting rid of their sales tax and increasing inflation. If they don't, then I guess that their only option is to increase export sales via price cuts, but whether that affects foreign consumer prices or not is far from clear.
What I don't understand is this constant press statement that the Chinese economy is in trouble, which it most certainly isn't - the retraction does exist and is due to ever increasing costs, and especially labour costs, but their growth rate is still extremely high.