Starting from the mid-19th century, the term was used by Karl Marx and Marxist theorists to refer to a social class that included shop-keepers and professionals. Though distinct from the ordinary working class and the lumpenproletariat, who rely entirely on the sale of their labor-power for survival, the petty remain members of the proletariat rather than the haute bourgeoisie, or capitalist class, who own the means of production and buy the labor-power of others to work it. Though the petty bourgeois do buy the labor power of others, in contrast to the bourgeoisie they typically work alongside their own employees; and although they generally own their own businesses, they do not own a controlling share of the means of production. The modern term for the petty bourgeoisie, a class that lies between the workingmen and the capitalists, would be the middle class.