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sharing
Sharing scarce goods and services and attention is the greatest social challenge. When sharing fails, systems of property and monetary systems necessarily take over to deal with scarcity and limit violence in some ways that favour the ones who run the system.
Thinkers have encountered various problems with sharing, and considered different things to be the hardest to share:
Karl Marx for instance claimed that it's the economic goods we cannot share easily, accordingly control of productive capital is the thing we must find ways to share so that ownership of the production will be a foregone conclusion and lead to less conflict.
Sigmund Freud emphasized that it's the sexual objects that we are least willing to share, as animals. And, controversially at the time, that to children the attention of parents is quite sexualized and a prototype of the kinds of attention they crave later in life, forming many habits of relationship.
Friedrich Nietszche claimed that it's power we cannot share... the darkest and least promising vision, as there are at least ways to divide sexual attention or economic goods or services. However, each decision is different, so sharing decision making is one of the hardest things to do.