It looks like this thread isn’t going anymore but I can’t help but chime in. This is primarily to neoclassical. It’s a bit long but I think it’s worth reading for anyone interested in these issues.
Since you seem to regard yourself as purely scientific (which is contrasted with the supposedly “barbaric” theories of the Austrians), maybe by casting the ABCT in a more ‘scientific’ manner, you will be more open to it’s content.
I claim that the ABCT is a specific example of a more general phenomena, fluctuations, that characterize all complex adaptive systems. A network of neurons, a colony of ants, or an economy are all susceptible to what can be called an Adaptive Complex System Fluctuation (ACSF). I will define precisely what this is after giving an example.
Take a colony of ants. They compose a complex adaptive system (see Wikipedia for a precise definition). What is critical to know for understanding a fluctuation is the means by which the elements of complex adaptive system communicate. In the case of ants it is by pheromones. There are a variety of pheromones that communicate a variety of information. A primary activity of ants is to forage for food. Once an ant finds food it returns to the colony. Along the way it leaves a trail of pheromones that direct other foraging ants to the location of the food. Those ants that come into contact with the trail follow it to the location. If they find food, they return with it and also reinforce the trail with their own pheromones, strengthening it and thereby drawing other foraging ants. This is a remarkably efficient system, not only for locating food but also for establishing the shortest possible path to the location. In fact, their behavior has been simulated in order to arrive at near solutions to various instances of the Traveling Salesman Problem.
So how does this relate to a fluctuation? Imagine we got our hands on some of the pheromone that’s created by ants when they find food. Or better yet, imagine there is a chemical that mimics it, and thereby deceives an ant into thinking it’s the correct chemical. In either case, what we could, and what has been done, is we could lay down a pheromone trail artificially, one that wouldn’t even lead to food. This would direct foraging ants to the location. Now, since there would be no food, that trail would eventually diminish as no new ants would reinforce the trail. In order to draw greater and greater numbers of ants we would have to continually reinforce that trail. Of course, in so doing the ant colony will be completely diverted from all productive activity, even though in some sense they’ve been given the impression that food is on the way. In any case, the misdirected ants would eventually return to an un-systematically misdirected process of foraging. Of course, in the mean time they would experience a significant drop in output, resulting in the shrinking of the colony.
So this is a general example of a fluctuation. There are similarities between it and an economic fluctuation. The essence of the feedback processes are the same, but the specific content and communication mechanism are very different. In any case, this motivates a precise definition for your Mr. Fama.
A CASF is the culmination of a diversion and then reversion of a CAS’s agents directed productive behavior on the basis of it’s communicative mechanism being artificially produced and mimicked and then entered at specific and fixed point into the system. I could probably make this definition better; in fact, it could probably defined in precise mathematical terms, but I think this covers all relevant aspects.
Now, the obvious question that needs to be answered is, how do this stand up to RE? First of all, I think a lot of people, even it’s most ardent supporters, mis-understand the content and therefore power of RE. In fact, I would say that, on the one hand, RE does not rule out true cycles in the sense described above, and that, on the other hand, for those who do think it does, they have invoked a type of RE that is far too strong, and in fact is logically inconsistent.
First, I will address the “too strong” type of RE of which I do not think the better of economists, mainstream that is, subscribe too. The strong form of RE says that an agent of a CAS can perceive all properties and underlying reality of the system. It can also be stated slight differently as, a collection of agents do not systematically misconceive the underlying reality or content of their surroundings and the system of which they are a part. Of course, under this form of RE there can be no such thing as a fluctuation since a collection of agents can perceive all objective phenomena that the communicative mechanism is supposed to represent (pheromones, money, electrical signals, etc.). Thus, under this form of RE artificial pheromones systematically entered cannot trick a colony of ants because they do not stray from the objective reality surrounding it (that is, with regard to food). But of course, this notion is absurd! It’s like saying an ant or neuron can perceive a level of intelligence that exceeds its own capability. In fact, if agents were endowed with such intelligence, the communicative mechanism would be completely superfluous. Their presence (the communicative mechanism) is thus obvious evidence of their necessity for the composition of the CAS. As Mises argued, without money an economy cannot rationally allocate resources. This is no different than saying that without pheromones, ants cannot rationally forage for food. These communicative mechanisms co-evolved with the elements to allow for the production of outcomes not possible for the individual element operating alone. And if we suppose, as those who believe in strong RE do, that a system of elements can on average always perceive the underlying reality of what they are directed towards, than we must ask ourselves why do communicative mechanisms like money or pheromones, or any other form, exist in the first place? However, if we understand the nature of CAS, and the role that the communicative mechanism plays in holding it together, then we can at once see that if the individual agents are removed from the mechanism the system would collapse.
Now, the weaker form of RE simply says that, on average, agents do not systematically misjudge prices (in the case of ants, pheromones), that is, they do not systematically misconceive the communicative mechanism. This is a much weaker, although accurate, form of RE. It’s claim has to do with a level removed from the underlying reality. Thus, despite the fact that agents may predict future prices on average correctly, that does not necessitate that the system of which they compose operates according to the underlying reality that prices are supposed to represent. For if prices become disconnected from consumers (or if pheromones become disconnected from foraging ants) than they no longer represent the underlying reality. So, despite the fact that agents do not systematically misconceive prices they may misconceive the underlying reality, in this case the desires of consumers. This only conflicts with the strong form of RE.
One more comment on the strong form of RE. When economists like Fama or Lucas or Sargent claim that an economy is not susceptible to a cycle under RE, they are not being mindful of the nature of a CAS and the intelligence of it’s agents, and the communicative mechanism on which they depend. They presuppose a level of intelligence on behalf of the individual agent that exceeds it’s own capability. And in fact, this has already been proved using computational complexity arguments. Now, they may claim that they are not claiming such intelligence on an individual level but that, as expressed before, agents will on the whole not be off when it comes to the underlying reality. But once again, this ignores the fact that the individual agents must rely on a communicative mechanism, and that that mechanism is once removed from the reality it’s supposed to convey.
I hope my arguments are clear. If you have questions please let me know.