Sun, Apr 05, 2009 - Page 9 News List

Financial systems must understand the role of asset-price swings

Containing systemic risks is about understanding how they grow or ease in response to the value of assets. Excessive swings in a crisis could then be tempered

By Roman Frydman and Michael D. Goldberg

The near-complete collapse of financial systems worldwide has exposed fundamental weaknesses in their architecture and in how they are regulated. In calling for measures to “guard against systemic risk,” the G20 summit has begun the process of reconstruction by recognizing that the system in its entirety, not just individual institutions, must be regulated.

Unfortunately, the G20 communique offers only more of the same prescriptions for managing systemic risk that the Financial Stability Forum, the US Federal Reserve and others have put forward.

These proposals have focused on the problems caused by poor transparency, over-leveraging, outsized financial institutions, tax havens, bad incentives for financial bosses and credit rating agencies’ conflicts of interest. All of these are important, but they miss a fundamental point.

No one now denies that the past year’s sharp downswings in housing and equity prices, which followed long upswings — far above historical benchmark levels — helped to trigger and fuel the crisis. As these downswings continue, there is a danger that they, too, may become excessive, dragging the financial system and the economy even deeper into crisis.

Containing systemic risks, therefore, requires not just ensuring transparency and managing leverage in the system, but also recognizing that these risks vary along with asset values. If institutions that were heavily exposed had understood this, they would have raised their capital buffers during the run-up in housing and equity prices in order to protect themselves against the inevitable reversals. But, as we now know, they did not.

One reason for this failure is that pillar 1 of the Basel II Agreement, which outlines how banks around the world should assess credit risks and determine the size of capital buffers, makes no explicit allowance for long-swing fluctuations in asset markets. Instead, it relies on value-at-risk measures that link risk to standard notions of short-term market volatility.


The problem here is that these measures implicitly assume that risk declines when markets are doing well; they demand less capital during calm periods and more capital during volatile periods. In effect, the presumption is that capital losses are random, so the sharp reversals and losses that usually ensue after excessive upswings in prices are disregarded in risk calculations.

Indeed, because standard measures of the probability of default fall when the economy is doing well and rise when it is not, capital requirements based on these measures tend to be pro-cyclical. But this increases systemic risk rather than reducing it.

The G20 has now called for revising the Basel II standards so that capital requirements become countercyclical, and Spain’s experience with such requirements suggests that doing so is a step in the right direction. But such revisions of Basel II are not enough, because bank portfolios — especially those of international banks with large trading books — are vulnerable to the risks stemming from long-swing fluctuations in asset markets.

As a result, not only are countercyclical measures needed, but bank capital requirements should vary inversely with the boom-and-bust fluctuations in the asset markets to which they are heavily exposed. Bank defenses need to be fortified during excessive upswings in asset prices so that they are able to weather the inevitable reversals.

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