by Calculated Risk on 12/07/2009 11:55:00 AM

From Professor Duy: Structural and Cyclical

For several months, I have been telling stories that decompose US economic activity into what I think of as cyclical and structural dynamics. I believe the distinction is very important to firms, markets, and policymakers who need to be aware when one dynamic is clouding their view of the other.

The cyclical dynamics, in my opinion, are the most spectacular, the most visible. The real cyclical fireworks began in the second half of [2008], as the energy price shock decimated household budgets, quickly followed by a financial shock that triggered an additional pullback in demand. Firms unexpectedly found they had far too much excess capacity in this environment, and began the process of "rightsizing." [Job] losses mounted even as falling energy costs and lower interest rates for those not credit constrained began to put a floor under spending.

Eventually, firms would realign capacity with the new level of demand, and job losses would taper off. That would mark the early stages of the cyclical bottom, the point at which growths returns. The initial growth spurt could be very rapid, as firms restock inventory and pent-up demand comes into play. The additional of government stimulus will add additional fuel to the fire.

Once the early stages of recovery are complete, the story shifts from cyclical to structural. The boost from inventory correction, pent-up demand, and government stimulus fade, and the underlying growth rate, the fundamental rates of activity, becomes evident. Now your expectations about the nation's economic direction depend on the weight you place on the structural factors. If you place nearly zero weight on those factors, then growth remains fairly high as the economy rapidly returns to potential. In effect, cyclical dynamics dominate your story; the Fed is simply flipping a switch that shifts the economy from high to low states and back again, a traditional post-WWII business cycle. If you place heavy weight on structural stories, you talk about the inability to revert to past patterns of consumer spending growth due to excessive household debt, a reversion to global imbalances that supports outsized import growth, lack of an asset bubble to compensate for these structural problems, etc. With these stories in your toolkit, you expect a low underlying growth rate - barely at potential growth - in which case the gap between actual and potential output remains distressingly high for possibly years to come.

A nice summary of the differences between those who expect a "V-shaped" recovery, and those that believe the recovery will be sluggish. I think growth will be sluggish primarily because of the overhang of excess housing inventory (slowing any recovery in residential investment), and because consumers will increase their saving rate to repair their household balance sheets. There is much more in Dr. Duy's post.