First, in contrast to the textbook account of shocks to the Money supply via the proverbial helicopter drop of base money (pound notes), firms and households are not caught in a bind where, in aggregate, they are forced to hold the increased supply of broad money, even if it exceeds demand. Following a shock to the supply of credit, in which some people or companies become less credit constrained, it will be open to others to reduce their existing borrowing as the extra money circulates around the economy via the purchase of goods, services and financial assets. Second, and more important, the shocks to credit supply are, in themselves, real not nominal shocks. And like other real shocks, causing changes in the balance of Aggregate Demand and Aggregate Supply, there is a nominal effect only if monetary policy does not respond via alterations to the path of short-term interest rates to keep the economy on a stable path and in line with the inflation target. Absent an appropriate policy response, the easing in monetary conditions would in time feed into inflation through an expansion of nominal spending. In the first instance, the expansion of “liquidity” represented by faster money growth may sometimes work through asset prices. That is because with imperfect substitution between different kinds of financial assets, relative risk premia may be altered, which in turn may affect borrowing conditions in capital markets.
8  BIS Review 149/2007  It cannot be ruled out that, for a while, the M4L growth rate may deceive as to the underlying pace of credit expansion in the economy. That is important because, in a nutshell, the turmoil in financial markets is not just a “City” event. How potent it will be macroeconomically will depend on how long current conditions persist, and the feedback loop between the financial economy and the real economy. As to its persistence, necessary conditions for an alleviation of the current strains in credit markets are probably at least twofold. First, that the US housing and household debt markets stabilise. Second, that banks and other financial intermediaries recognise impairments to asset values, so that uncertainties about counterparty credit risks begin to reduce. On the financial-real economy interaction, we must try to avoid a vicious circle in which tighter liquidity conditions, lower asset values, impaired capital resources, reduced credit supply, and slower aggregate demand feed back on each other. A variety of policy responses are possible. The announcement yesterday by central banks of co-ordinated action via term auctions to alleviate pressure in financing markets is directed at that. Second, regulatory authorities around the world are monitoring banks’ liquidity and capital positions, including in the context of Basel II. And, thirdly, monetary policy also can in principle play a role, through what is effectively a “financial accelerator” working through bank balance sheets, where that is consistent with maintaining stable inflation in the medium term.