Business cycle by Charles Dunoyer, and similar theories, showing signs of influence by Sismondi, were developed by Johann Karl Rodbertus. Periodic crises in capitalism formed the basis of the theory of Karl Marx, who further claimed that these crises were increasing in severity and, on the basis of which, he predicted a communist revolution. Though only passing references in "Das Kapital" (1867) refer to crises, they were extensively discussed in Marx's posthumously published books, particularly in "Theories of Surplus Value". In "Progress and Poverty" (1879), Henry George focused on land's role in crises – particularly land speculation – and proposed a single
The Communist Manifesto in the hands of shop-window mannequins, displayed in come-hither poses and fashionable décolletage." A number of late-20th- and 21st-century writers have commented on the "Communist Manifesto"s continuing relevance. In a special issue of the "Socialist Register" commemorating the "Manifesto"s 150th anniversary, Peter Osborne argued that it was 'the single most influential text written in the nineteenth century.' Academic John Raines in 2002 noted that "In our day this Capitalist Revolution has reached the farthest corners of the earth. The tool of money has produced the miracle of the new global market and the ubiquitous shopping mall. Read "The Communist Manifesto",