AeroFunk said:
While I don't know anything about Robert Michel or his theory, I would have to disagree with the premise that "the tendency of the leaders to organize themselves and to consolidate their interests."
You are right. Michels believed the process was inevitable based on his experience in the German socialist movement.
AeroFunk said:
Why does he make the assumption that leaders will not have conflicting interests?
He never did. In fact, it was his source of dissatisfaction with the inability of leaders to act that led him to support "charismatic leaders" as the means to break through bureaucratic impasse. Michels was very aware that the socialist leaders could not agree among themselves. But they would agree if a charismatic leader could charm them into doing so.
AeroFunk said:
What is the mechanism by which they consolidate their conflicting interests?
Michels did not have a theory so there were no hypotheses or mechanisms. More contemporary sociology tries to predict how likely movements are to emerge, how likely they are to maintain themselves, and how likely they are to die. This is called political process theory. The theory is highly rigorous, mechanistic, predictive, and dominant. Political scientists are now beginning to use it as well to explain social movement behavior.
Another field in economics, sociology and psychology named organization theory and behavior deals with the internal workings of organizations. The best macro-theories are probably sociological, while the best micro-theories are probably psychological. Economist theories are a bit too simplistic because they rely on unrealistic assumptions to model human behavior and are too functionalist (if something exists, it's because it makes organizations efficient; not a very testable proposition). There are so many different perspectives in this field that it would take a long time to explain them. But you can look it up on Wikipedia.
Of course, there is widespread recognition in the social sciences today that Michels' explanation was overly simplistic.
AeroFunk said:
Also the empirical evidence seems to contradict his theory, according to the http://www.deloitte.com/dtt/cda/doc/content/us_tmt_ce_ShiftIndex_0620092_1344(3).pdf" released just recently, the US economy has become much more competitive over time, and not more oligarchical.
Michels was NOT talking about economic oligarchy at the macro-level. He was talking about organizational oligarchy. Be careful not to confuse the two. However, there is a debate in political science and sociology (and some economists, like the late Kenneth Galbraith and Joseph Schumpeter) about the relationship between economic oligarchy and democracy. The idea is that when you have a large number of competing interest groups, you are more likely to have a democratic system where the groups need to compromise to regulate the economy. There is an assumption that these interest groups are organized and seek to monopolize the economy, which led to Schumpeter's famous assertion that capitalism and socialism result in the same consequences -- a monopoly of power, or something along those lines. The idea there is that capitalism is a system of survival of the fittest. If everyone competes with everyone, and in the end, you end up with one large firm controlling economic activity, that is no different than having the government control all economic activity. In either case, you have a monopoly of power and economy, which brings innovation to a halt. Very interesting stuff. People like W. Brian Arthur have extended this thinking with chaos theory to say that you want to operate at the edge of chaos -- where the government's role is to stimulate variation and prevent monopolization.
AeroFunk said:
I think the best theory, and a slightly more modern theory, about group organization is Mancur Olson's
https://www.amazon.com/dp/0674537513/?tag=pfamazon01-20
I would disagree on "best" and "modern." It is not the "best" theory because it cannot account for social relations or psychological motives for collective action. It is an economic theory that assumes people will only participate if they are induced (receiving some form of payment) to do so. Otherwise, collective action does not happen. But this purportedly "economically rational" behavior does not happen in most movements. People tend to join movements because their friends invite them, because they are dissatisfied with the way things are, because they sense opportunities for upward mobility, etc. [As an aside, did you know most revolutions happen because of rising aspirations? i.e., the poor cannot mobilize because they have to worry about getting enough to eat. The rich don't mobilize because they are content with the system. It is only the middle class that organizes revolutions when their standards of living begin to improve because, probably, they want to sit at the table with the rich.] Economists stretch their theory to account for things like solidarity -- if I feel solidarity with you and participate for that reason, that is an inducement. The problem is that, if everything is an inducement, what does the theory explain? You need to be able to predict, e.g., these inducements will lead to participation; these won't; etc.
The theory is definitely not modern. Olson came up with it in the 1970's. Economists continue to work in the framework, but political process theorists have definitely become the dominant scholars of social movements. Their detailed historical accounts of movements have cast doubts on economic theories. The current debate lies on whether psychological or social factors are more important in movement emergence, as well as what role do elites play in movement development (e.g., one prediction is that elites who exercise too much force to crack down on a movement strengthen it by enabling the movement to get media coverage -- awareness -- and widespread sympathy).