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 but such a document was later deemed inappropriate for an open, non-confrontational organisation. Engels nevertheless wrote the "Draft of a Communist Confession of Faith", detailing the League's programme. A few months later, in October, Engels arrived at the League's Paris branch to find that Moses Hess had written an inadequate manifesto for the group, now called the League of Communists. In Hess's absence, Engels severely criticised this manifesto, and convinced the rest of the League to entrust him with drafting a new one. This became the draft "Principles of Communism", described as "less of a credo and more of an