"For Schumpeter, there was something both noble and tragic about the spirit of capitalism."

Robert Skidelsky in the Guardian:

"Testifying recently before a United States congressional committee, former Federal Reserve chairman Alan Greenspan said that the recent financial meltdown had shattered his "intellectual structure". I am keen to understand what he meant.

Since I have had no opportunity to ask him, I have to rely on his memoirs, The Age of Turbulence, for clues. But that book was published in 2007 – before, presumably, his intellectual structure fell apart.

In his memoirs, Greenspan revealed that his favorite economist was Joseph Schumpeter, inventor of the concept of "creative destruction"( ALL THIS MEANS IS THAT BUSINESSES COME AND GO. IT IS NOT PROFOUND. ). In Greenspan's summary of Schumpeter's thinking, a "market economy will incessantly revitalise itself from within by scrapping old and failing businesses and then reallocating resources to newer, more productive ones". Greenspan had seen "this pattern of progress and obsolescence repeat over and over again".

Capitalism advanced the human condition, said Schumpeter, through a "perennial gale of creative destruction", which he likened to a Darwinian process of natural selection to secure the "survival of the fittest"( A VERY BAD ANALOGY. BUT COMMON. ). As Greenspan tells it, the "rougher edges" of creative destruction were legislated away by Franklin Roosevelt's New Deal, but after the wave of de-regulation of the 1970s, America recovered much of its entrepreneurial, risk-taking ethos. As Greenspan notes, it was the dot-com boom of the 1990s that "finally gave broad currency to Schumpeter's idea of creative destruction".

This was the same Greenspan who in 1996 warned of "irrational exuberance" and, then, as Fed chairman, did nothing to check it. Both the phrase and his lack of action make sense in the light of his (now shattered) intellectual system.

It is impossible to imagine a continuous gale of creative destruction taking place except in a context of boom and bust. Indeed, early theorists of business cycles understood this. (Schumpeter himself wrote a huge, largely unreadable, book with that title in 1939.)

In classic business-cycle theory, a boom is initiated by a clutch of inventions – power looms and spinning jennies in the 18th century, railways in the 19th century, automobiles in the 20th century. But competitive pressures and the long gestation period of fixed-capital outlays multiply optimism, leading to more investment being undertaken than is actually profitable. Such over-investment produces an inevitable collapse. Banks magnify the boom by making credit too easily available, and they exacerbate the bust by withdrawing it too abruptly. But the legacy is a more efficient stock of capital equipment.

Dennis Robertson, an early 20th-century "real" business-cycle theorist, wrote: "I do not feel confident that a policy which, in the pursuit of stability of prices, output, and employment, had nipped in the bud the English railway boom of the forties, or the American railway boom of 1869-71, or the German electrical boom of the nineties, would have been on balance beneficial to the populations concerned." Like his contemporary, Schumpeter, Robertson regarded these boom-bust cycles, which involved both the creation of new capital and the destruction of old capital, as inseparable from progress.

Contemporary "real" business-cycle theory builds a mountain of mathematics on top of these early models, the main effect being to minimise the "destructiveness" of the "creation". It manages to combine technology-driven cycles of booms and recessions with markets that always clear (ie there is no unemployment).

How is this trick accomplished? When a positive technological "shock" raises real wages, people will work more, causing output to surge. In the face of a negative "shock", workers will increase their leisure, causing output to fall.

These are efficient responses to changes in real wages. No intervention by government is needed. Bailing out inefficient automobile companies such as General Motors only slows down the rate of progress. In fact, whereas most schools of economic thought maintain that one of government's key responsibilities is to smooth the cycle, "real" business-cycle theory argues that reducing volatility reduces welfare!

It is hard to see how this type of theory either explains today's economic turbulence, or offers sound instruction about how to deal with it. First, in contrast to the dot-com boom, it is difficult to identify the technological "shock" that set off the boom. Of course, the upswing was marked by super-abundant credit. But this was not used to finance new inventions: it was the invention( ONE COULD ARGUE THIS ). It was called securitised mortgages. It left no monuments to human invention, only piles of financial ruin.

Second, this type of model strongly implies that governments should do nothing in the face of such "shocks". Indeed, "real" business-cycle economists typically argue that, but for Roosevelt's misguided New Deal policies, recovery from the Great Depression of 1929-1933 would have been much faster than it was.

Equivalent advice today would be that governments the world over are doing all the wrong things in bailing out top-heavy banks, subsidising inefficient businesses, and putting obstacles in the way of rational workers spending more time with their families or taking lower-paid jobs. It reminds me of the interviewer who went to see Robert Lucas, one of the high priests of the New Business Cycle school, at a time of high American unemployment in the 1980s.
"My driver is an unemployed PhD graduate," he said to Lucas. "Well, I'd say that if he is driving a taxi, he's a taxi-driver," replied the 1995 Nobel laureate.

Although Schumpeter brilliantly captured the inherent dynamism of entrepreneur-led capitalism, his modern "real" successors smothered his insights in their obsession with "equilibrium" and "instant adjustments". For Schumpeter, there was something both noble and tragic about the spirit of capitalism. But those sentiments are a world away from the pretty, polite techniques of his mathematical progeny."

I have to say that Schumpeter's world view was not close to mine. It was tragic, but more like the Eternal Return of Nietzsche. The current Mechanistic Economics is a melange of slightly useful theories and models. Nothing more.