"The one important distinction between the two factors of production is that in a free society, ownership of the human factor, labor, cannot be concentrated while ownership of the non-human factor, capital, can be."

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Thus, the capital owner is not a parasite or a rentier but a worker - a capital worker. A distinction between labor work and capital work suggests the lines along which we could develop economic institutions capable of dealing with increasingly capital-intensive production, as our present institutions cannot.

— Louis O. Kelso