Josiah Warren is widely regarded as the first American anarchist and the four-page weekly paper he edited during 1833 called "The Peaceful Revolutionist" was the first anarchist periodical published, an enterprise for which he built his own printing press, cast his own type and made his own printing plates. Warren was a follower of Robert Owen and joined Owen's community at New Harmony, Indiana. Josiah Warren termed the phrase "Cost the limit of price", with "cost" referring not to monetary price paid, but the labor one exerted to produce an item. Therefore, "e proposed a system to pay people with certificates indicating how many hours of work they did. They could exchange the notes at local time stores for goods that took the same amount of time to produce." He put his theories to the test by establishing an experimental "labor for labor store" called the Cincinnati Time Store where trade was facilitated by notes backed by a promise to perform labor. The store proved successful and operated for three years after which it was closed so that Warren could pursue establishing colonies based on mutualism (these included Utopia and Modern Times). Warren said that Stephen Pearl Andrews' "The Science of Society", published in 1852, was the most lucid and complete exposition of Warren's own theories. American individualist anarchist Benjamin Tucker argued that the elimination of what he called "the four monopolies"—the land monopoly, the money and banking monopoly, the monopoly powers conferred by patents and the quasi-monopolistic effects of tariffs—would undermine the power of the wealthy and big business, making possible widespread property ownership and higher incomes for ordinary people, while minimizing the power of would-be bosses and achieving socialist goals without state action. Tucker influenced and interacted with anarchist contemporaries—including Lysander Spooner, Voltairine de Cleyre, Dyer Lum and William Batchelder Greene—who have in various ways influenced later left-libertarian thinking.