Bhutan's economy is based on agriculture, forestry, tourism and the sale of hydroelectric power to India. Agriculture provides the main livelihood for 55.4 percent of the population. Agrarian practices consist largely of subsistence farming and animal husbandry. Handicrafts, particularly weaving and the manufacture of religious art for home altars, are a small cottage industry. A landscape that varies from hilly to ruggedly mountainous has made the building of roads and other infrastructure difficult and expensive.