Noah Smith has a post up  examining Paul Krugman's remarkable record of accurate economic predictions. Ask "KrugTron the Invincible", as Smith dubs him, and he will point to his use of Keynesian economics for simple rule-of-thumb guesstimates, which then get cleaned up with his understanding of the problems of a liquidity trap . But Smith wonders if there's a more specific reason for Krugman's hit-rate:
Like Voltron before him, he's borrowing heavily from Japan.
See, I myself am fairly agnostic about Keynesian ideas. But I've expected nothing but low growth, low interest rates, and low inflation since 2008 (though I haven't been as confident about these things as Krugman, and am thus not in his class as a super-robot). I expected these things because of one simple proposition: We are like Japan.
Since its land bubble popped in 1990, Japan has had low inflation and low interest rates and low growth, even as government debt mounted and quantitative easing was tried. Paul Krugman was there. He watched Japan carefully, and he often states that it deeply affected his thinking. In fact, it might not be an exaggeration to say that watching Japan made Krugman the Keynesian he is today .
The comparison is, at the moment, more relevant to the US than the UK. Our problems are pretty clear: we slashed investment coming out of a recession, which put the brakes on recovery. Now that we're (slowly) putting our foot back on the accelerator, we can expect a return to growth – at least until deficit reduction becomes a priority again. Insofar as we have any macroeconomic phenomena confounding economists, it's positive news: our unemployment rate is significantly lower than it should be, given our anaemic recovery. That's been pegged on underemployment , productivity declines , and the government fiddling the figures , but it doesn't call for a wholesale reworking of economic theory.
The Japanese experience, however, does. Its "lost decade" – now well on the way to being twenty years long – has stubbornly resisted everything thrown at it so far. The pessimistic view is that it's just what happens when demographics turn sour: with an ageing society and migration too low to counteract it, the economy is retooling to serve the needs of retirees, for whom long-term growth isn't a priority.
But Abenomics , the name for the broad package of unconventional policy measures brought in by the government of Shinzo Abe, offers a ray of hope. And if any of those tools, which range from monetized nationalisation of industrial stock to explicitly targeting the stock market to performing one of the largest rounds of qualitative easing ever, work, then there's a meaningful plan of action for not just Japan, but the US as well.
If they don't, then hopefully it won't take America the same twenty years it's taken Japan to realise that business as usual just won't cut it.