First of all, what people think they know about past currency wars isn’t actually true. Everyone uses some combination phrase like “protectionism and competitive devaluation” to describe the supposed vicious circle of the 1930s, but as Barry Eichengreen has pointed out many times, these really don’t go together. If country A and country B engage in a tit-for-tat of tariffs, the end result is restricted trade; if they each try to push their currency down, the end result is at worst to leave everyone back where they started.
And in reality the stuff that’s now being called “currency wars” is almost surely a net plus for the world economy. In the 1930s this was because countries threw off their golden fetters — they left the gold standard and this freed them to pursue expansionary monetary policies. Today that’s not the issue; but what Japan, the US, and the UK are doing is in fact trying to pursue expansionary monetary policy, with currency depreciation as a byproduct.
There is a serious intellectual error here, typical of much of the recent discussion of this issue. A currency war is by definitiona low-level form of a trade war because currencies are internationally traded commodities. The intent (and there is much circumstantial evidence to suggest that Japan at least is acting with mercantilist intent, but that is another story for another day) is not relevant — currency depreciation is currency depreciation and still has the same effects on creditors and trade partners, whatever the claimed intent. Continue reading »