Writer, demonstrating a gift for expressing complex ideas in simple terms. In 1879, he published Progress and Poverty, in which he pointed out that the wealthy extracted huge profits from the ownership of land. Land existed in a fixed amount and became more valuable as populations increased and as cities developed. Society, rather than the landlord, was responsible for the increase in value; George termed this profit "unearned increment." He advocated the enactment of a single tax system that would transfer unearned increment to the government to fund a variety of social programs. All other forms of taxation could be abolished and monopolies and poverty would disappear. George's ideas were immensely popular and single tax societies were formed throughout the nation. Tax reform and the curbing of the power of the idle rich became popular causes.