Warren posted a comment to an August 28, 2012 post that those not following the RSS feed will miss, so I am posting it separately.
It's a comment on Sergio Cesaratto — A reply to Wray - Part I & II
in a monetary union like the US or EU, for purposes of this analysis the only kind of regional problem you can have is an unemployment problem. In other words, if there happens to be full employment in all regions there's no problem, regardless of what the inter regional trade numbers happen to be. If there is unemployment, it's a problem whether related to trade or not, and subject to the same adjustments regardless of source.
When some regions are at full employment it can be problematic to simply increase aggregate demand at the macro level to sustain full employment in all regions. Should that be the case the 'answer' becomes 'fiscal transfers' where the central govt. directs public spending to the areas of high unemployment. While this works well to sustain full employment throughout the region, it's unfortunately misunderstood as a transfer of wealth to the areas of high unemployment from the taxpayers of the low unemployment regions.
In fact, while it's an addition of nominal wealth to the high unemployment regions, the production and exportation of public goods and services to other members of the union is in fact a reduction of real terms of trade for the high unemployment regions doing the production relative to the low unemployment regions doing the consumption, as exports are real costs and imports real benefits.
So while fiscal transfers for the production of public goods and services that serve the entire union are commonly presumed to be benefits to the high unemployment regions and costs to the low unemployment regions, in real terms the reverse is almost always the case.