Exploitation of resources, especially petroleum, dominates the Iranian industrial economy. Today, Ᾱbādān is the world's largest refinery, with a capacity of 5 00,000 b/d. Other mining and processing activities are far less important in the economy of Iran than the petroleum industry. This could in some limited degree be the result of the available geological surveys. One of the major obstacles to Iran's economic development has been the shortage of cheap electric power. As on 1961, demand was twice of the generating and distributing capacity. The next modern industry to develop after petroleum was the processing of food and other agricultural products. By 1959, sugar production exceeded 83,000 tons. Following the growth of industries based upon, and located on or near, mineral and agricultural resources, there have developed other industries, whose location is determined primarily by the availability of local markets. Traditional arts and crafts were no longer significant in the eighteenth and early nineteenth centuries.