Some of them argue that if state intervention ceased, these types of incomes would disappear due to increased competition in capital. Although Proudhon opposed this type of income, he expressed: "[...] I never meant to [...] forbid or suppress, by sovereign decree, ground rent and interest on capital. I believe that all these forms of human activity should remain free and optional for all". Insofar as they ensure the workers right to the full product of their labor, mutualists support markets and private property in the product of labor. However, they argue for conditional titles to land, whose private ownership is legitimate only so long as it remains in use or occupation (which Proudhon called "possession"). Proudhon's mutualism supports labor-owned cooperative firms and associations for "we need not hesitate, for we have no choice [...] it is necessary to form an ASSOCIATION among workers [...] because without that, they would remain related as subordinates and superiors, and there would ensue two [...] castes of masters and wage-workers, which is repugnant to a free and democratic society" and so "it becomes necessary for the workers to form themselves into democratic societies, with equal conditions for all members, on pain of a relapse into feudalism". As for capital goods (man-made, non-land "means of production"), mutualist opinion differs on whether these should be commonly managed public assets or private property. Evolution As a term, "mutualism" has seen a variety of related uses. Charles Fourier first used the French term mutualisme in 1822, although the reference was not to an economic system. The first use of the noun "mutualist" was in the New-Harmony Gazette by an American Owenite in 1826. In the early 1830s, a labor organization in Lyons, France called themselves the Mutuellists. Pierre-Joseph Proudhon was involved with the Lyons mutualists and later adopted the name to describe his own teachings. In What Is Mutualism?, Clarence Lee Swartz gives his own account of the origin of the term, claiming that "[t]he word "mutualism" seems to have been first used by John Gray, an English writer, in 1832". When John Gray's 1825 Lecture on Human Happiness was first published in the United States in 1826, the publishers appended the Preamble and Constitution of the Friendly Association for Mutual Interests, located at Valley Forge. 1826 also saw the publication of the Constitution of the Friendly Association for Mutual Interests at Kendal, Ohio. By 1846, Proudhon