Peter Kropotkin, often seen as the most important theorist of anarchist communism, outlined his economic ideas in The Conquest of Bread and Fields, Factories and Workshops. Kropotkin felt that co-operation is more beneficial than competition, arguing in his major scientific work Mutual Aid: A Factor of Evolution that this was well-illustrated in nature. He advocated the abolition of private property through the "expropriation of the whole of social wealth" by the people themselves, and for the economy to be co-ordinated through a horizontal network of voluntary associations where goods are distributed according to the physical needs of the individual, rather than according to labor. He further argued that these "needs," as society progressed, would not merely be physical needs but "[a]s soon as his material wants are satisfied, other needs, of an artistic character, will thrust themselves forward the more ardently. Aims of life vary with each and every individual; and the more society is civilized, the more will individuality be developed, and the more will desires be varied."He maintained that, in anarcho-communism:...houses, fields, and factories will no longer be private property, and that they will belong to the commune or the nation and money, wages, and trade would be abolished. — Peter Kropotkin, The Conquest of BreadIndividuals and groups would use and control whatever resources they needed, as the aim of anarchist communism was to place "the product reaped or manufactured at the disposal of all, leaving to each the liberty to consume them as he pleases in his own home." He supported the expropriation of property to ensure that everyone would have access to what they needed without being forced to sell their labour to get it.We do not want to rob any one of his coat, but we wish to give to the workers all those things the lack of which makes them fall an easy prey to the exploiter, and we will do our utmost that none shall lack aught, that not a single man shall be forced to sell the strength of his right arm to obtain a bare subsistence for himself and his babes. This is what we mean when we talk of Expropriation... — Peter Kropotkin, The Conquest of BreadHe said that a "peasant who is in possession of just the amount of land he can cultivate," and "a family inhabiting a house which affords them just enough space... considered necessary for that number of people" and the artisan "working with their own tools or handloom" would not be interfered with, arguing that "[t]he landlord owes his riches to the poverty of the peasants, and the wealth of the capitalist comes from the same source."In summation, Kropotkin described an anarchist communist economy as functioning like this:Imagine a society, comprising a few million inhabitants, engaged in agriculture and a great variety of industries--Paris, for example, with the Department of Seine-et-Oise. Suppose that in this society all children learn to work with their hands as well as with their brains. Admit that all adults, save women, engaged in the education of their children, bind themselves to work 5 hours a day from the age of twenty or twenty-two to forty-five or fifty, and that they follow occupations they have chosen in any one branch of human work considered necessary. Such a society could in return guarantee well-being to all its members; that is to say, a more substantial well-being than that enjoyed to-day by the middle classes. And, moreover, each worker belonging to this society would have at his disposal at least 5 hours a day which he could devote to science, art, and individual needs which do not come under the category of necessities, but will probably do so later on, when man's productivity will have augmented, and those objects will no longer appear luxurious or inaccessible. Peter Kropotkin, The Conquest of BreadWhile many anarcho-communists are opposed to trade, some post-left and post-scarcity anarcho-communists, and ones with syndicalist sympathies, are not opposed to trade. Some support a non-monetary form of trade in the form of non-monetary commons. Others such as Tiziana Terranova easily see anarcho-communism being compatible with a non-hierarchical, open access, free association, non-monetary form of trade such as P2P.