Thursday 12 November 2009

Not all bubbles are the same...

Frederic Mishkin, author and professor of finance at Columbia University and a former member of the Fed Board, believes not all asset-price bubbles are dangerous and one has to understand the underlying drivers before panicking about the effects of very accommodating monetary policies. Excerpts from an article that was published on FT.com follows:
There is increasing concern that we may be experiencing another round of asset-price bubbles that could pose great danger to the economy. Does this danger provide a case for the US Federal Reserve to exit from its zero-interest-rate policy sooner rather than later, as many commentators have suggested? The answer is no.
Asset-price bubbles can be separated into two categories. The first and dangerous category is one I call “a credit boom bubble”, in which exuberant expectations about economic prospects or structural changes in financial markets lead to a credit boom. The resulting increased demand for some assets raises their price and, in turn, encourages further lending against these assets, increasing demand, and hence their prices, even more, creating a positive feedback loop. This feedback loop involves increasing leverage, further easing of credit standards, then even higher leverage, and the cycle continues.
Eventually, the bubble bursts and asset prices collapse, leading to a reversal of the feedback loop. Loans go sour, the deleveraging begins, demand for the assets declines further and prices drop even more. The resulting loan losses and declines in asset prices erode the balance sheets at financial institutions, further diminishing credit and investment across a broad range of assets. The resulting deleveraging depresses business and household spending, which weakens economic activity and increases macroeconomic risk in credit markets. Indeed, this is what the recent crisis has been all about.
The second category of bubble, what I call the “pure irrational exuberance bubble”, is far less dangerous because it does not involve the cycle of leveraging against higher asset values. Without a credit boom, the bursting of the bubble does not cause the financial system to seize up and so does much less damage. For example, the bubble in technology stocks in the late 1990s was not fuelled by a feedback loop between bank lending and rising equity values; indeed, the bursting of the tech-stock bubble was not accompanied by a marked deterioration in bank balance sheets. This is one of the key reasons that the bursting of the bubble was followed by a relatively mild recession. Similarly, the bubble that burst in the stock market in 1987 did not put the financial system under great stress and the economy fared well in its aftermath.
Because the second category of bubble does not present the same dangers to the economy as a credit boom bubble, the case for tightening monetary policy to restrain a pure irrational exuberance bubble is much weaker.
Asset-price bubbles of this type are hard to identify: after the fact is easy, but beforehand is not. Nonetheless, if a bubble poses a sufficient danger to the economy as credit boom bubbles do, there might be a case for monetary policy to step in. However, there are also strong arguments against doing so, which is why there are active debates in academia and central banks about whether monetary policy should be used to restrain asset-price bubbles.
But if bubbles are a possibility now, does it look like they are of the dangerous, credit boom variety? At least in the US and Europe, the answer is clearly no. Our problem is not a credit boom, but that the deleveraging process has not fully ended. Credit markets are still tight and are presenting a serious drag on the economy.
Tightening monetary policy in the US or Europe to restrain a possible bubble makes no sense at the current juncture.

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