Distributism is a socio-economic system which is characterized by the wide distribution of ownership of productive property. Like any other socio-economic theory such as socialism, there are variations on the idea, perhaps wide ones, which keep some precepts but not necessarily all of them, and also possibly change the means of implementation of those that are accepted.
In its simplest form, Distributism says that productive property, such as agricultural land and factories should be owned by the employees, according to some rule. The theory behind the system originated over a hundred years ago, and then production was thought of as concerning material goods only; thus the distributists thought that property was easily divisible into productive and non-productive property. Leisure was not a good to be produced, and so a public park was not productive property and did not fall under the mandate to be owned and governed by those responsible for the activities needed to continue to provide leisure to the public. Neither was a transportation system thought to be productive, as the moving of goods and people from place to place was not a product. Nowadays that concept has been clarified and the legacy concepts of material-only productive goods has been generalized to other intangible goods. Distributist concepts are not particularly affected by the generalization of productive property for material goods to all property.
Distributism took as one of its benefits the increase in motivation of individuals that arises when their efforts are rewarded both with a wage or salary as well as an increase in the value of the property which produces the benefits. However, such an increase would not occur in a steady-state economy, and if the distributist system does not provide this benefit in a steady-state system, how might it be expected to work in the other two situations, where the economy is shrinking or when it is growing? There may be great value in distributing the ownership of property to the population, but motivation is not necessarily one of them. Perhaps Distributism sees workers as comprising three categories: those who will work industriously in any situation; those who will never work industriously on their own but will seek to do only the minimum forced upon them for survival by the system; and those who are motivated only by the opportunity to receive more benefits if they work harder and smarter.
If the third category is a substantial fraction of the total, Distributism will show a higher productivity if ownership of the means of production allows this category of worker to produce more. How might this happen? For a few classes of workers, they could spend more time if they owned their means of production, and could work themselves to exhaustion if they chose to. For workers in mass production, it is hard to see how an individual in such an operation, even if a part owner, could increase his hours of work except in some unusual circumstances. In those circumstances, it would make no difference if he was a part owner or not. The assembly line, or whatever the production method was, will not run extra hours simply because certain individuals wish it to.
Just Deserts as a socioeconomic system might result in the same arrangements, but for an entirely different reason. Distributism believes that the distribution of property to a large fraction of the population will improve the efficiency of production, and this is a sufficiently important issue that it should be done. Just Deserts believes there is no way individuals can legitimately earn enough to have huge differences in the amount of property owned, and so there is no way that such ownership disparity could happen, except by legacy ownership, and that would be gradually erased as the new socio-economic system were put into operation.
The question of how to arrange for ownership of things well beyond the ability of an individual to own is not clearly decided. Employee ownership is one example, but stock ownership is another, and community ownership yet another. All three are used extensively in our current economic arrangements, and all three seem to work well. For the first two, there are employee owned corporations that successfully compete with similar corporations where ownership is by the sale of stock; neither category seems to have an inherent advantage that propels them to dominate the other. Community ownership is used for certain classes of things, such as roads and schools, but there are certainly examples of roads and schools which are privately owned, by stockholders, and they seem to both work about the same. There are also, in some countries, extensive public ownership of utilities or even ordinary corporations, and they do not quickly crumble.
Long term effects might differ, but it would seem that a socio-economic system with a diversity of ownership types might have some advantages. The three categories of ownership might be originated in different ways. Just Deserts does not prohibit private ownership, but simply makes it impossible for someone to accrete sufficient unearned income as their wealth so that there would be orders of magnitude differences in the amount an individual would own, compared to the mean or mode. It might be that ownership was not by individuals, but by households, but this should make little difference in the way the society would function.
One of the major advantages of unfettered capitalism is the ease by which large quantities of resources can be amassed for the purpose of starting new businesses. There is a great tendency for those without large amounts of excess capital to use their income, perhaps totally, as the basis for their level of consumption. For Just Deserts to work, a mandatory fraction would have to be withheld for the purposes of amassing capital that could be put to the task of creating new businesses, when such were necessary. There would need to be other withholdings as well, such as for old age and disability insurance, health care insurance and other individual expenses. But in addition to these, there would have to be a capital fund withdrawal.
There is little obvious or immediate benefit to the individual from such a capital fund withholding. It would be subject to claims against it for consumption purposes. Some sort of social barriers are necessary to prevent this.
As any large block of capital, collected capital would be subject to corrupt use. Capitalism has few barriers to the corruption of government and internal agents of companies and corporations, such as supply officers, but in cases where there is no monopoly or cartel operating, there is competition. Competition eliminates some mis-uses of capital. Poor matching of supply and demand serves as another barrier to the poor use of capital. These would have the same effect under a Just Deserts system as under capitalism. One type of corruption in capitalism involves the obtaining capital under false pretenses or without the proper checking of the planned uses of it. This would also exist under Just Deserts, except that the source of the capital would be somewhat different. The source under capitalism might be an individual or a group of individuals with high wealth, whereas under Just Deserts the equivalent source would be an agency designed to make good use of withholdings from workers.
As noted before, the benefit from corruption under capitalism is to increase the income or wealth of the person causing the corruption; under Just Deserts the same could be true, but there would be a massive difference in scale. An individual or small group of individuals under capitalism could, if they were wealthy, engage in corruption whereas the group would have to be so large under Just Deserts, it would be unlikely to occur. Of course, if the scale of corruption goes down, it would be possible to have some, but the effect of it would be much less grand, meaning much less money would be diverted because of the corruption. Thus, Just Deserts makes corruption somewhat less likely, but by no means impossible. A Distributism system would have much less accumulation of wealth, as property, by some means, stays widely distributed. If a more general Distributism system were installed, so that not only productive capital was widely distributed, but all forms of wealth, then the same conclusions about corruption that pertain to Just Deserts also pertain to Distributism.
One proclaimed advantage of Distributism is that the dispersal of capital would make production more efficient, by motivating large numbers of individuals to work harder with the capital they had. Just Deserts has even a better claim to this, as not only is capital more finely dispersed, it is productivity which is rewarded with higher income, just as it is under capitalism. Under Just Deserts, the only way open to obtaining a higher standard of living is to earn more by producing more. Capitalism rewards hard workers, but it rewards the holders of unearned income even more, and allows rewards to accrue which are not connected with productivity. By focusing the attention of everyone on productivity and reducing the propensity for corruption, Just Deserts might be seen as the socio-economic system which actually generates efficiency in the economy, as Distributism and capitalism were reputed to be, but do not necessarily.