Is Japan the most successful society in the world? Even the question is likely (all right, designed) to provoke ridicule and have you spluttering over your breakfast. The very notion flies in the face of everything we have heard about Japan’s economic stagnation, indebtedness and corporate decline.

Ask a Korean, Hong Kong or US businessman what they think of Japan, and nine out of 10 will shake their head in sorrow, offering the sort of mournful look normally reserved for Bangladeshi flood victims. “It’s so sad what has happened to that country,” one prominent Singaporean diplomat told me recently. “They have just lost their way.” It is easy to make the case for Japan’s decline. Nominal gross domestic product is roughly where it was in 1991, a sobering fact that appears to confirm the existence of not one, but two, lost decades. In 1994, Japan’s share of global GDP was 17.9 per cent, according to JPMorgan. Last year it had halved to 8.76 per cent. Over roughly the same period, Japan’s share of global trade fell even more steeply to 4 per cent. The stock market continues to thrash around at one-quarter of its 1990 level, deflation saps animal spirits – a common observation is that Japan has lost its “mojo” – and private equity investors have given up on their fantasy that Japanese businesses will one day put shareholders first.

Certainly, these facts tell a story. But it is only partial. Underlying much of the head-shaking about Japan are two assumptions. The first is that a successful economy is one in which foreign businesses find it easy to make money. By that yardstick Japan is a failure and post-war Iraq a glittering triumph. The second is that the purpose of a national economy is to outperform its peers.