Forest fires are judged to be nasty, especially when one's own house or life is threatened, or when grave harm is being done to tourist attractions. The popular conviction that fires are an unqualified evil reached its zenith after a third of Yellowstone Park in the US was destroyed by fire in 1988. Nevertheless, conventional wisdom among forest managers remains that it is best to let natural forest fires burn themselves out, unless particularly dangerous conditions apply. Burning appears to be part of a natural process of forest rejuvenation. Moreover, intermittent fires burn away the undergrowth that might accumulate and make any eventual fire uncontrollable.
Perhaps modern macroeconomists could learn from the forest managers. For decades, successive economic downturns and even threats of downturns (“pre-emptive easing”) have been met with massive monetary and often fiscal stimuli. This was the case when the global stock market crashed in 1987, and it was repeated when the property boom in many countries collapsed in the early 1990s. Interest rate rises were put on hold during the Asian crisis of 1997, even though traditional indicators said some industrial countries were overheating. Rates were then sharply reduced in 1998, after the collapse of the hedge fund Long-Term Capital Management, and were lowered again when the stock market collapsed in 2001. Today, policy rates in most industrial countries are close to zero, in response to the financial crisis.
What needs reflection, against this backdrop, is whether the policy re-action to each successive set of difficulties laid the foundations for the next one. Worse, the encouragement by lower interest rates of debt accumulation and spending imbalances was the equivalent of undergrowth accumulating in the forest. This undergrowth not only made subsequent downturns more dangerous; it also made the available policy instruments less reliable in response. Looking back over successive cycles, interest rates have had to be reduced with ever more vigour to get the same (and sometimes reduced) response from spending. Most recently, new and untried policies such as quantitative and credit easing have had to be introduced. Logically, the end point of such a dynamic process would seem to be the mother of all fires and few if any means of resistance.