What has the market turmoil of August been telling us? The answer, I suggest, is three big things: first, the debt-encumbered economies of the high-income countries remain extremely fragile; second, investors have next to no confidence in the ability of policymakers to resolve the difficulties; and, third, in a time of high anxiety, investors prefer what are seen as the least risky assets, namely, the bonds of the most highly rated governments, regardless of their defects, together with gold. Those who fear deflation buy bonds; those who fear inflation buy gold; those who cannot decide buy both. But few investors or corporate managers wish to take on any longer-term investment risks.

Welcome, then, to what Carmen Reinhart, senior fellow at the Peterson Institute for International Economics in Washington, and Harvard's Kenneth Rogoff call "the second great contraction" (the Great Depression of the 1930s being the first). Those less apocalyptic might call it the "Japanese disease".

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Now consider, against this background of continuing fragility, how people view the political scene. In neither the US nor the eurozone, does the politician supposedly in charge - Barack Obama, the US president, and Angela Merkel, Germany's chancellor - appear to be much more than a bystander of unfolding events, as my colleague, Philip Stephens, recently noted. Both are - and, to a degree, operate as - outsiders. Mr Obama wishes to be president of a country that does not exist. In his fantasy US, politicians bury differences in bipartisan harmony. In fact, he faces an opposition that would prefer their country to fail than their president to succeed. Ms Merkel, similarly, seeks a non-existent middle way between the German desire for its partners to abide by its disciplines and their inability to do any such thing. The realisation that neither the US nor the eurozone can create conditions for a speedy restoration of growth - indeed the paralysing disagreements over what those conditions might be - is scary.