So each part cannot be expanded, enlarged or reduced. Assets are therefore always distributed among the population. No one can in any way obtain anything more than he is assigned. In fact you thereby create a society that unites the liberal element of capitalism with communal controlled rules of transmission.
Although capitalism is primarily a way of dealing with reserves/stocks, this way has mainly been based on a practice of strong mutual competition for access, and less on practices in which equal division was useful. It therefore contains two design errors, it makes excessively unequal access possible, and it secures nobody to a basic extent. It is propelled by the need for cushions/back ups/reserves. And so actually makes itself necessary. More and more blankets around you, buffers for when, for later, for the children if then. Everyone keeps on grabbing, there is no end to it. It is cruel and limitless.
The mistake of communism is in their reformatory character by applying the idea of the commons too deep into the private lives of the inhabitants. All those private places had to be broken open and regulated because they also opted for making everyone's efforts highly productive by training people to become specialists and then connecting them in series in large-scale production processes. But that meant on the one hand that everyone was exposed one-sided, and therefore started to diverge (qua values, knowledge, living condition), and on the other hand concatenating in series of highly centralized production processes caused intensive long-distance exchange lines between the processes. If you then have to coordinate all that, you get a mountain of planning and control, and consequently a prison regime for everyone.