text: production and construction of housing. 75. During the period in question, 12 building materials plants were set up and firmly established throughout the country, 8 regional building firms specialized in houses were established, as well as 3 consultancy firms and 2 construction supplies enterprises. CQnclus.io.ns 76. As a whole, these 10 years may be divided into two quite distinct phases. The first from the triumph of the Revolution up until 1985, was marked by a greater housing construction. During the first years of the Revolution, construction was designed to satisfy urban demand and the need to consolidate the labour force in the main production and export centres. The priority sectors were mining (Rosita, Siuna, Bonanza, El Limon mine); sugar production (the Benjamin Zeledon, Javier Guerra, German Pomares, Julio Buitrago and Camilo Ortega sugar mills); banana production (El Viejo and Tonala), and the Rigoberto Lopez rice plant. 77. The second phase began in 1986, when the exhaustion of the national economy by the imperialist agression called for a considerable cut-back in investment in the social sector, on account of which there was a sharp drop in housing construction. In February 1988, the Government broke up the organization of MINVAH into various agencies and transferred most of its responsibilities to the municipal councils. 78. It should be stressed that, in order to guarantee access by low-income social sectors to the housing that was built, the State provided the housing on the basis of a 20-year option for sale and with heavy subsidies, on account of which return on investment has been scant and has failed to generate a multiplier effect. In addition, persons who had undertaken to purchase a total of 15,000 dwellings built with BAVINIC funds during the Somoza period, as well as 12,000 units built during the current period, benefited from the 
analysis: The text appears to be discussing the development of housing infrastructure in Nicaragua, specifically the period from the Revolution to the late 1980s. The text highlights the establishment of various organizations and firms involved in the production and construction of housing, as well as the government's policies and subsidies to ensure access to housing for low-income social sectors. The text also mentions the decline in housing construction due to economic constraints.