American individualist anarchist Benjamin Tucker identified as a socialist and argued that the elimination of what he called the four monopolies, namely 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. Kevin Carson characterizes American individualist anarchism by saying: "Unlike the rest of the socialist movement, the individualist anarchists believed that the natural wage of labor in a free market was its product and that economic exploitation could only take place when capitalists and landlords harnessed the power of the state in their interests. Thus, individualist anarchism was an alternative both to the increasing statism of the mainstream socialist movement and to a liberal movement that was moving toward a mere apologetic for the power of big business. Two individualist anarchists who wrote in Benjamin Tucker's "Liberty" were also important labor organizers of the time. Joseph Labadie and Dyer Lum. Kevin Carson has praised Lum's fusion of individualist "laissez-faire" economics with radical labor activism as "creative" and described him as "more significant than any in the Boston group".