Curious why nobody at the G-7 or G-20 had the gall to outright accuse Japan of currency manipulation? Simple: because everyone else in the G-7 and G-20 has been doing precisely what Japan only recently started doing a few months ago. As such, it would be outright "glass house" hypocrisy if there was a formal Japanese condemnation by the group of overlevered nations, which moments ago released its draft communique not naming the island nation outright as was widely expected. Of course, that the G-20 did notaccuse Japan of engaging in what everyone clearly knows is currency war, does not mean that everyone else is not doing this. To the contrary: they are, and the lack of a stern rebuke of Japan simply means the currency wars will now intensify, devolving into the same protectionism and trade wars as the first Great Depression was so familiar with, which to borrow a parallel from history again, will end with the kind of war that ultimately ended the first Great Depression.
Nomura's Robert Koo explains:
Currency devaluation the natural response for trade deficit nations
For example, US Treasury secretary Lawrence Summers reacted angrily when Japan’s Ministry of Finance ignored western government warnings in June 1999 and tried to push the yen lower with a ¥3trn intervention from a starting level of 117 to the dollar. When the US reaction was made known, the yen climbed sharply and stopped only when it had approached 100. Today, in contrast, Japan is running a trade deficit vis-à-vis the world and Europe (exports to the US still exceed imports). It is natural for a country running a trade deficit to reduce the deficit by devaluing its currency, and trading partners would have little justification for opposing such a move. ...