 Since the Romans, land ownership has been concentrated to a greater degree than elsewhere in Spain into large estates, called "latifundia", worked by numerous landless labourers.Many of these rural labourers were drawn to the anarchist movement in the later 19th and earlier 20th centuries.Industry has been slow to develop and forms a smaller part of the economy than in other parts of Spain; much of it consists of smaller-scale plants processing primary products.