While politicians anxiously check the shifting weather-vanes of public opinion and scientists squabble over facts as well as interpretations, central banks are resolutely doing what they do best - wildly exceeding their briefs and trying to drown all problems in a flood of newly-created money.As ever, the underconsumptionists worry that a lack of demand will usher in deflation, in spite of all such efforts. Some of us, however, worry more about what it will do to supply.Here, we explain why.