It is interesting to note how the orginators of the ParEcon system comment about it.
In their FAQ about how leading economists have responded, they say that traditional market economists have largely ignored the concept.
What has the reaction to ParEcon been in the mainstream of professional economics?QUOTE
It has been overwhelmingly ignored. What is interesting about that is that it isn’t confined to the visionary work – which maybe you could alibi by saying that economists see their job as analyzing what is, not prescribing what ought to be – but it extends as well to our analytic work.
Perhaps it is simply terminology, but calling one's own work "visionary" seems...

(I believe he is referring to the underlying concepts, rather than the analysis of such, but visionary seems a poor choice of words from a humble scientist...)
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To argue against markets is deemed by the mainstream profession apriori incoherent and even demented – especially if the people doing it are also arguing against central planning, as in our case.
The truth of his statement is fairly well substantiated in this thread. Most people cannot conceive of a system better than the free market, because they have never seen one. Of course, that does not mean that a new proposed system will be better, as the author that that FAQ seems to almost imply.
Let's examine the key concept of this system, the concept of "balanced job complexes".
Parecon is hard to explain quickly to my friends. Can you cram it into one sentence?QUOTE
What exactly is a balanced job complex?
A balanced job complex is a collection of tasks within a workplace that is comparable in its burdens and benefits and in its impact on the worker’s ability to participate in decision making to all other job complexes in that workplace. Workers have responsibility for a job complex in their main workplace, and often for additional tasks outside to balance their overall work responsibilities with those of other workers in society.
This proposal is for a restructuring of jobs. One would not simply be a mailman (for example), one would deliver mail part of the time and (assuming this job is unsatisfactory and toiling) and ice cream taste tester the other part of the time.
What baffles me about this concept is how one evaluates which jobs are odious and tedious and which ones are rewarding and empowering.
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It would be materially and socially just regarding the allocation of tasks and rewards for doing them to do as you say. If someone has an odious and deadening job, and another person has a delightful and enriching one, pay the former person more than the latter – in accord with effort and sacrfice.
I think the author ignores the fact that what one person finds enriching and rewarding, another finds odious and tedious. How do we balance such things? Somehow, this system proposes to reward people more for doing jobs that they hate.
There is a saying: "Find a job you love and you'll never work a day in your life." That is the best of all worlds under capitalism. The worker is doing something they enjoy, so they do it well. Their attention will wander less and their quality of work will be above average. Even under capitalism, workers will take a job they love for less money than they would take a job they hate (the teaching profession comes to mind). But ParEcon seems to reward those who go into field they hate. It seems to reward finding an unrewarding job. Something seems fundamentally wrong with that being a basis of the system.
Let's see an example from the author of ParEcon:
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Wouldn’t balanced job complexes be unfair for highly trained people? There are quite a few 'upper-level' jobs that require years of schooling that actually are really boring and somewhat unpleasant.
Two issues here. Years of schooling. And boring.
Schooling like working, is part of one’s complex assuming it is socially beneficial, once one is beyond the basic graduation age. So that is no problem. If schooling were horribly onerous, then it would be remunerated accordingly, but of course that is generally nonsense. Give anyone the option of going to grad school for living wages or working the same period in a coal mine for – what, double that, triple that, ten times as much – and their choice is pretty obvious. But, hey, however society turns out to assess these options, so it goes. Boring and onerous and dangerous, etc., are remunerated.
His statement "however society turns out to assess these options" seems to indicate to me that there isn't a lot of thought put into thinking about just how this situation would work out. It seems likely that the worst jobs would be paid the highest. In his example, coal miners would make more than college professors. But that would lead to a dramatic increase in the cost of coal, wouldn't it?
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As to now, I would wager that there isn’t a coordinator class person around who would switch to an assembly line job, say, even if offered a higher wage then their current one, to do it. Not one. But please consider, what makes their jobs boring and rote and unrewarding, to the extent they are? Isn’t it in large part their limited say (capitalists still rule, not them) and on the other hand the pains associated with the power over others that they do have, as well as the often inane character of the things they produce for another’s profit?

My boss has often told me that he would much rather have an ordinary machinist's job than that of Production Coordinator. The only barrier to him switching is money. My boss doesn't hate his job, he simply would rather be doing something else.
Under ParEcon, instead of Mozart spending all his time composing, he would be required to dig ditches part of the time to compensate for the rewarding nature of his primary occupation. The losses of having a genius waste his talent of menial tasks, according to the author, are offset by the release of previously bottled up potential in ordinary "rote" workers. He makes the assumption that the current system is hindering the development of certain individuals who are doomed to assembly line jobs.
I submit that his analysis is completely off base. Geniuses who work on factory lines (for example) will still flourish in their free time. Or their genius is manifested in applications to improving their current job. After such a breakthrough, the genius factory worker will not remain on the assembly line long. How does the author think that the assembly line was invented? By some guy dreaming in a field? No, someone familiar with the work invented it.
ParEcon is a radical idea. Paying people more to have tedious, unrewarding jobs with little authority, paying people less if they enjoy their job or they direct the work of others.
Decisions are made by committee. Unfortunately, this would never work. We see from the Communist experience that the proletariat cannot directly make day to day decisions. So the proletariat have representatives appointed for them to make decisions. That was how Communism was run in Russia (for example) and we know how that turned out.
The author summarizes ParEcon in these four statements:
RemunerationQUOTE
(1) Everyone receives a socially average income of items and services of their choosing, and those who have special needs for more (such as medicine, etc.) get that too – all by right, as citizens.
(2) Everyone who is able (but not those who aren’t, of course) has a responsibility to work at a socially average job complexes producing socially valued outputs of his or her choosing, for a socially average length of time each month. However, if one wishes to, and if one’s work situations allow for it, one can work some overtime for proportionately more than the socially average income, or somewhat less than the social average, for proportionately less than the social average income. (the above is what remuneration according to effort and sacrifice plus balanced job complexes comes out to...)
(3) The total volume produced, and its composition of different items, and the actual tasks and procedures undertaken, and so on and so forth, are decided via participatory planning.
Now, the question we are discussing arises, should we add another norm – for example:
(4) Anyone who wishes to can decide for whatever reason they might have to work less than the social average by any amount they might choose, but still receive the socially average income.
Or, alternatively:
(4') There is some income deemed living (which is less than the social average) and anyone who wishes to, and is able, can decide not to work at all and nonetheless receive this living income by right. And we might think of some other possibilities, as well.
It seems very close to communism to me, when looked at in this light. They add in a caveat about working more and getting more or working less and getting less (but never less than a "living wage") but is this a reality?
Quantifying the entire economy ahead of time, and allocating the proceeds of the labor by committee seems like a very complex system. Measuring effort, while trying to compensate for factors such as better capital equipment, seems like and insanely complex task.
The goal (like Communism's) of solidarity, equity (material and circumstantial), participatory self management, and diversity are laudable. However, systems which seek to balance such quantities for every individual when the factors themselves are subjective, seems doomed to failure.