   quadragesimo anno (latin for âin the 40th yearâ) is an encyclical issued by pope pius xi on 15 may 1931, 40 years after leo xiii's encyclical rerum novarum. unlike leo xiii, who addressed the condition of workers, pius xi discusses the ethical implications of the social and economic order. he describes the major dangers for human freedom and dignity arising from unrestrained capitalism and totalitarian communism. he also calls for the reconstruction of the social order based on the principle of solidarity and subsidiarity. essential contributors to the formulation of the encyclical quadragesimo anno were the german jesuits, roman catholic theologians and social philosophers gustav gundlach and the kÃ¶nigswinterer kreis through one of its main authors oswald von nell-breuning. ==changes since rerum novarum == pope pius xi issued his encyclical exactly forty years after rerum novarum. in the interim there were other papal statements from leo xiii, and also the encyclical singulari quadam of pope pius x. pius xi subtitled his encyclical reconstruction of the social order. in the first part he reviews and applauds the encyclical of his predecessor. the church can be credited with participating in the progress made and contributing to it. it developed a new social conscience.quadragesimo anno 16â40 ==private property == the church has a role in discussing these issues. social and economic issues are vital to her not from a technical point of view but in terms of moral and ethical issues involved. ethical considerations include the nature of private propertyquadragesimo anno 44â52 concerning which, within the catholic church, several conflicting views had developed. pope pius xi proclaims private property to be essential for the development and freedom of the individual. those who deny private property deny personal freedom and development. but, says pius, private property has a social function as well. private property loses its morality if it is not subordinated to the common good. therefore governments have a right to pursue redistribution policies. in extreme cases, the pope recognises that the state has a right to expropriate private property.quadragesimo anno 114â115 == capital and labour== 
1931_works Documents_of_the_Catholic_Social_Teaching_tradition Papal_encyclicals Works_by_Pope_Pius_XI