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Reference.org
Circulus (theory)
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<p>Circulus was a <a href="/facts/Socioeconomics/ywuuTTUN">socioeconomics</a> doctrine devised by nineteenth-century French <a href="/facts/Utopian_socialism/vtn0yqt1">utopian</a> <a href="/facts/Socialist/U2kVoPaA">socialist</a> <a href="/facts/Pierre_Leroux/Rc2Rqy00">Pierre Leroux</a> (1797–1871), who proposed that human <a href="/facts/Excrement/r9HDKB8G">excrement</a> be collected by the state in the form of a <a href="/facts/Tax/8cXNkA00">tax</a> and used as <a href="/facts/Fertiliser/ysh3r6NJ">fertiliser</a>, thereby increasing agricultural production sufficiently to prevent <a href="/facts/Malthusian_catastrophe/jbR6UF1B">Malthusian catastrophe</a>. </p>