such limitations on wealth include the desire for equality of opportunity, a fear that great wealth leads to political corruption, to the belief that limiting wealth will gain the political favor of a voting bloc, or fear that extreme concentration of wealth results in rebellion. Various forms of socialism attempt to diminish the unequal distribution of wealth and thus the conflicts and social problems arising from it. During the Age of Reason, Francis Bacon wrote "Above all things good policy is to be used so that the treasures and monies in a state be not gathered into a few hands… Money is like fertilizer, not good except it be spread." The rise of Communism as a political movement has partially been attributed to the distribution of wealth under capitalism in which a few lived in luxury while the masses lived in extreme poverty or deprivation. However, in the Critique of the Gotha Program, Marx and Engels criticized German Social Democrats for placing emphasis on issues of distribution instead of on production and ownership of productive property. While the ideas of Marx have nominally influenced various states in the 20th century, the Marxist notions of socialism and communism remains elusive. On the other hand, the combination of labor movements, technology, and social liberalism has diminished extreme poverty in the developed world today, though extremes of wealth and poverty continue in the Third World. In the Outlook on the Global Agenda 2014 from the World Economic Forum the widening income disparities come second as a worldwide risk. See also Wealth distribution in Europe Distributive justice Generational accounting Gini coefficient Economic inequality Kinetic exchange models of markets List of countries by financial assets per capita List of countries by total wealth List of countries by wealth per adult List of countries by wealth inequality References External links U.N. statistics – Distribution of Income and Consumption; wealth and poverty Research on the World Distribution of Household Wealth (UNU-WIDER) CIA World Factbook: Field Listing – Distribution of family income – Gini index Annual income of richest 100 people enough to end global poverty four times over. Oxfam International, January 19, 2013. Wealth surveys Many countries have national wealth surveys, for example: The British Wealth and Assets Survey The Italian Survey on Household Income and Wealth The euro area Household Finance and Consumption Survey The US Survey of Consumer Finances The Canadian Survey of Financial Security