The criticisms that hurt are those one suspects might be fair. This might explain the outrage from Berlin last week over the criticism by the US Treasury of Germany’s huge and vaunted trade surplus. But the Treasury is to be commended for stating what Germany’s partners dare not: “Germany has maintained a large current account surplus throughout the euro area financial crisis.” This “hampered rebalancing” for other eurozone countries and created “a deflationary bias for the euro area, as well as for the world economy”. The International Monetary Fund has expressed similar worries.

The German finance ministry responded that its current account surplus was “no cause for concern, neither for Germany, nor for the eurozone, or the global economy”. Indeed, a spokesman stated that the country “contributes significantly to global growth through exports and the import of components for finished products”. This reaction is as predictable as it is wrong. The surplus, forecast by the IMF at $215bn this year (virtually the same as China’s) is indeed a big issue, above all for the future of the eurozone.

Export surpluses do not reflect merely competitiveness but also an excess of output over spending. Surplus countries import the demand they do not generate internally. When global demand is buoyant, this need not be a problem provided the money borrowed by deficit countries is invested in activities that can subsequently service the debts they are incurring. Alas, this does not happen often, partly because the deficit countries are pushed by the supply of cheap imports from surplus countries towards investing in non-tradeable activities, which do not support the servicing of international debts. But in current conditions, when short-term official interest rates are close to zero and demand is chronically deficient across the globe, the import of demand by the surplus country is a “beggar-my-neighbour” policy: it exacerbates this global economic weakness.